21626753513 has 16 divisors (see below), whose sum is σ = 23141655936. Its totient is φ = 20160792960.

The previous prime is 21626753503. The next prime is 21626753521. The reversal of 21626753513 is 31535762612.

It is a cyclic number.

It is not a de Polignac number, because 21626753513 - 2¹⁶ = 21626687977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21626753503) 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, 928670 + ... + 951672.

It is an arithmetic number, because the mean of its divisors is an integer number (1446353496).

Almost surely, 2^21626753513 is an apocalyptic number.

21626753513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21626753513 is a deficient number, since it is larger than the sum of its proper divisors (1514902423).

21626753513 is a wasteful number, since it uses less digits than its factorization.

21626753513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24064.

The product of its digits is 226800, while the sum is 41.

Subtracting 21626753513 from its reverse (31535762612), we obtain a palindrome (9909009099).

The spelling of 21626753513 in words is "twenty-one billion, six hundred twenty-six million, seven hundred fifty-three thousand, five hundred thirteen".