21013331211 has 12 divisors (see below), whose sum is σ = 30636259992. Its totient is φ = 13877962656.

The previous prime is 21013331177. The next prime is 21013331327. The reversal of 21013331211 is 11213331012.

21013331211 is a `hidden beast` number, since 210 + 1 + 333 + 121 + 1 = 666.

It is not a de Polignac number, because 21013331211 - 2⁶ = 21013331147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013331411) 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, 10909386 + ... + 10911311.

It is an arithmetic number, because the mean of its divisors is an integer number (2553021666).

Almost surely, 2^21013331211 is an apocalyptic number.

21013331211 is a deficient number, since it is larger than the sum of its proper divisors (9622928781).

21013331211 is a wasteful number, since it uses less digits than its factorization.

21013331211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21820810 (or 21820807 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21013331211 its reverse (11213331012), we get a palindrome (32226662223).

The spelling of 21013331211 in words is "twenty-one billion, thirteen million, three hundred thirty-one thousand, two hundred eleven".