21121020122211 has 24 divisors (see below), whose sum is σ = 30811065916176. Its totient is φ = 13940876030400.

The previous prime is 21121020122183. The next prime is 21121020122233. The reversal of 21121020122211 is 11222102012112.

21121020122211 is a `hidden beast` number, since 21 + 1 + 210 + 201 + 22 + 211 = 666.

It is not a de Polignac number, because 21121020122211 - 2⁵ = 21121020122179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121020122011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34064776 + ... + 34679258.

It is an arithmetic number, because the mean of its divisors is an integer number (1283794413174).

Almost surely, 2^{21121020122211} is an apocalyptic number.

21121020122211 is a deficient number, since it is larger than the sum of its proper divisors (9690045793965).

21121020122211 is a wasteful number, since it uses less digits than its factorization.

21121020122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652403 (or 652400 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121020122211 its reverse (11222102012112), we get a palindrome (32343122134323).

The spelling of 21121020122211 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, one hundred twenty-two thousand, two hundred eleven".