121131211210121 has 32 divisors (see below), whose sum is σ = 139361710878720. Its totient is φ = 103134919398336.

The previous prime is 121131211210099. The next prime is 121131211210231. The reversal of 121131211210121 is 121012112131121.

It is not a de Polignac number, because 121131211210121 - 2³⁰ = 121130137468297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121131211210093 and 121131211210102.

It is not an unprimeable number, because it can be changed into a prime (121131211210421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 901615970 + ... + 901750308.

It is an arithmetic number, because the mean of its divisors is an integer number (4355053464960).

Almost surely, 2^{121131211210121} is an apocalyptic number.

It is an amenable number.

121131211210121 is a deficient number, since it is larger than the sum of its proper divisors (18230499668599).

121131211210121 is a wasteful number, since it uses less digits than its factorization.

121131211210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136013.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 121131211210121 its reverse (121012112131121), we get a palindrome (242143323341242).

The spelling of 121131211210121 in words is "one hundred twenty-one trillion, one hundred thirty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".