20211012112121 has 16 divisors (see below), whose sum is σ = 20447057980800. Its totient is φ = 19975934579328.

The previous prime is 20211012112099. The next prime is 20211012112129. The reversal of 20211012112121 is 12121121011202.

It is a cyclic number.

It is not a de Polignac number, because 20211012112121 - 2³⁸ = 19936134205177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211012112121.

It is not an unprimeable number, because it can be changed into a prime (20211012112129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91888445 + ... + 92108133.

It is an arithmetic number, because the mean of its divisors is an integer number (1277941123800).

Almost surely, 2^{20211012112121} is an apocalyptic number.

It is an amenable number.

20211012112121 is a deficient number, since it is larger than the sum of its proper divisors (236045868679).

20211012112121 is a wasteful number, since it uses less digits than its factorization.

20211012112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221888.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20211012112121 its reverse (12121121011202), we get a palindrome (32332133123323).

The spelling of 20211012112121 in words is "twenty trillion, two hundred eleven billion, twelve million, one hundred twelve thousand, one hundred twenty-one".