21123426753 has 96 divisors (see below), whose sum is σ = 37995834240. Its totient is φ = 11434089600.

The previous prime is 21123426733. The next prime is 21123426773. The reversal of 21123426753 is 35762432112.

It is an interprime number because it is at equal distance from previous prime (21123426733) and next prime (21123426773).

It is not a de Polignac number, because 21123426753 - 2²⁰ = 21122378177 is a prime.

It is a super-2 number, since 2×21123426753² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21123426703) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3707575 + ... + 3713267.

It is an arithmetic number, because the mean of its divisors is an integer number (395789940).

Almost surely, 2^21123426753 is an apocalyptic number.

It is an amenable number.

21123426753 is a deficient number, since it is larger than the sum of its proper divisors (16872407487).

21123426753 is a wasteful number, since it uses less digits than its factorization.

21123426753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5788 (or 5751 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

Adding to 21123426753 its reverse (35762432112), we get a palindrome (56885858865).

The spelling of 21123426753 in words is "twenty-one billion, one hundred twenty-three million, four hundred twenty-six thousand, seven hundred fifty-three".