121211011120020 has 96 divisors (see below), whose sum is σ = 354149370021888. Its totient is φ = 30917380340352.

The previous prime is 121211011119937. The next prime is 121211011120057. The reversal of 121211011120020 is 20021110112121.

It is a happy number.

It is a super-2 number, since 2×121211011120020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 352897207 + ... + 353240513.

It is an arithmetic number, because the mean of its divisors is an integer number (3689055937728).

Almost surely, 2^{121211011120020} is an apocalyptic number.

121211011120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211011120020 is an abundant number, since it is smaller than the sum of its proper divisors (232938358901868).

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

121211011120020 is a wasteful number, since it uses less digits than its factorization.

121211011120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599189 (or 599187 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211011120020 its reverse (20021110112121), we get a palindrome (141232121232141).

The spelling of 121211011120020 in words is "one hundred twenty-one trillion, two hundred eleven billion, eleven million, one hundred twenty thousand, twenty".