21626768031 has 64 divisors (see below), whose sum is σ = 33860436480. Its totient is φ = 12138647040.

The previous prime is 21626768029. The next prime is 21626768063. The reversal of 21626768031 is 13086762612.

It is not a de Polignac number, because 21626768031 - 2¹ = 21626768029 is a prime.

It is a super-2 number, since 2×21626768031² (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 (21626768011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10533201 + ... + 10535253.

It is an arithmetic number, because the mean of its divisors is an integer number (529069320).

Almost surely, 2^21626768031 is an apocalyptic number.

21626768031 is a deficient number, since it is larger than the sum of its proper divisors (12233668449).

21626768031 is a wasteful number, since it uses less digits than its factorization.

21626768031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21626768031 in words is "twenty-one billion, six hundred twenty-six million, seven hundred sixty-eight thousand, thirty-one".