121221201020 has 24 divisors (see below), whose sum is σ = 254597170464. Its totient is φ = 48482261696.

The previous prime is 121221201001. The next prime is 121221201029. The reversal of 121221201020 is 20102122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221200986 and 121221201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221201029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227192 + ... + 542271.

It is an arithmetic number, because the mean of its divisors is an integer number (10608215436).

Almost surely, 2^121221201020 is an apocalyptic number.

121221201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221201020 is an abundant number, since it is smaller than the sum of its proper divisors (133375969444).

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

121221201020 is a wasteful number, since it uses less digits than its factorization.

121221201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777349 (or 777347 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221201020 its reverse (20102122121), we get a palindrome (141323323141).

The spelling of 121221201020 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, twenty".