121200221210020 has 48 divisors (see below), whose sum is σ = 269840888796528. Its totient is φ = 45569290895360.

The previous prime is 121200221210017. The next prime is 121200221210023. The reversal of 121200221210020 is 20012122002121.

It is a happy number.

121200221210020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (121200221210017) and next prime (121200221210023).

It can be written as a sum of positive squares in 8 ways, for example, as 8212717934656 + 112987503275364 = 2865784^2 + 10629558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121200221209976 and 121200221210003.

It is not an unprimeable number, because it can be changed into a prime (121200221210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230313661 + ... + 230839300.

It is an arithmetic number, because the mean of its divisors is an integer number (5621685183261).

Almost surely, 2^{121200221210020} is an apocalyptic number.

121200221210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200221210020 is an abundant number, since it is smaller than the sum of its proper divisors (148640667586508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121200221210020 is a wasteful number, since it uses less digits than its factorization.

121200221210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461153760 (or 461153758 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121200221210020 its reverse (20012122002121), we get a palindrome (141212343212141).

The spelling of 121200221210020 in words is "one hundred twenty-one trillion, two hundred billion, two hundred twenty-one million, two hundred ten thousand, twenty".