21122031711 has 16 divisors (see below), whose sum is σ = 31068161280. Its totient is φ = 12657395520.

The previous prime is 21122031703. The next prime is 21122031719. The reversal of 21122031711 is 11713022112.

It is an interprime number because it is at equal distance from previous prime (21122031703) and next prime (21122031719).

It is not a de Polignac number, because 21122031711 - 2³ = 21122031703 is a prime.

It is a super-2 number, since 2×21122031711² (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 (21122031719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3592915 + ... + 3598788.

It is an arithmetic number, because the mean of its divisors is an integer number (1941760080).

Almost surely, 2^21122031711 is an apocalyptic number.

21122031711 is a deficient number, since it is larger than the sum of its proper divisors (9946129569).

21122031711 is a wasteful number, since it uses less digits than its factorization.

21122031711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191806.

The product of its (nonzero) digits is 168, while the sum is 21.

Adding to 21122031711 its reverse (11713022112), we get a palindrome (32835053823).

The spelling of 21122031711 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, seven hundred eleven".