121211102110020 has 48 divisors (see below), whose sum is σ = 365498092518720. Its totient is φ = 29836578980736.

The previous prime is 121211102110001. The next prime is 121211102110073. The reversal of 121211102110020 is 20011201112121.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77699423650 + ... + 77699425209.

It is an arithmetic number, because the mean of its divisors is an integer number (7614543594140).

Almost surely, 2^{121211102110020} is an apocalyptic number.

121211102110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211102110020 is an abundant number, since it is smaller than the sum of its proper divisors (244286990408700).

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

121211102110020 is a wasteful number, since it uses less digits than its factorization.

121211102110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155398848884 (or 155398848882 counting only the distinct ones).

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

Adding to 121211102110020 its reverse (20011201112121), we get a palindrome (141222303222141).

The spelling of 121211102110020 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred ten thousand, twenty".