21311010111 has 16 divisors (see below), whose sum is σ = 29653620480. Its totient is φ = 13588016640.

The previous prime is 21311010107. The next prime is 21311010121. The reversal of 21311010111 is 11101011312.

It is not a de Polignac number, because 21311010111 - 2² = 21311010107 is a prime.

It is a super-2 number, since 2×21311010111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311010101) 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, 893580 + ... + 917118.

It is an arithmetic number, because the mean of its divisors is an integer number (1853351280).

Almost surely, 2^21311010111 is an apocalyptic number.

21311010111 is a deficient number, since it is larger than the sum of its proper divisors (8342610369).

21311010111 is a wasteful number, since it uses less digits than its factorization.

21311010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36686.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 21311010111 its reverse (11101011312), we get a palindrome (32412021423).

The spelling of 21311010111 in words is "twenty-one billion, three hundred eleven million, ten thousand, one hundred eleven".