21120212021211 has 12 divisors (see below), whose sum is σ = 30809022157680. Its totient is φ = 13940734006800.

The previous prime is 21120212021197. The next prime is 21120212021219. The reversal of 21120212021211 is 11212021202112.

21120212021211 is a `hidden beast` number, since 211 + 20 + 21 + 202 + 1 + 211 = 666.

It is not a de Polignac number, because 21120212021211 - 2¹⁵ = 21120211988443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120212021219) 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, 11617277431 + ... + 11617279248.

It is an arithmetic number, because the mean of its divisors is an integer number (2567418513140).

Almost surely, 2^{21120212021211} is an apocalyptic number.

21120212021211 is a deficient number, since it is larger than the sum of its proper divisors (9688810136469).

21120212021211 is a wasteful number, since it uses less digits than its factorization.

21120212021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23234556786 (or 23234556783 counting only the distinct ones).

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

Adding to 21120212021211 its reverse (11212021202112), we get a palindrome (32332233223323).

The spelling of 21120212021211 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, twenty-one thousand, two hundred eleven".