20212115121 has 12 divisors (see below), whose sum is σ = 31849393680. Its totient is φ = 12249766680.

The previous prime is 20212115087. The next prime is 20212115149. The reversal of 20212115121 is 12151121202.

It is not a de Polignac number, because 20212115121 - 2²⁶ = 20145006257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212115094 and 20212115103.

It is not an unprimeable number, because it can be changed into a prime (20212115921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102081291 + ... + 102081488.

It is an arithmetic number, because the mean of its divisors is an integer number (2654116140).

Almost surely, 2^20212115121 is an apocalyptic number.

It is an amenable number.

20212115121 is a deficient number, since it is larger than the sum of its proper divisors (11637278559).

20212115121 is a wasteful number, since it uses less digits than its factorization.

20212115121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204162796 (or 204162793 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 20212115121 its reverse (12151121202), we get a palindrome (32363236323).

The spelling of 20212115121 in words is "twenty billion, two hundred twelve million, one hundred fifteen thousand, one hundred twenty-one".