21514331553 has 36 divisors (see below), whose sum is σ = 34142749200. Its totient is φ = 12035955360.

The previous prime is 21514331551. The next prime is 21514331591. The reversal of 21514331553 is 35513341512.

It is not a de Polignac number, because 21514331553 - 2¹ = 21514331551 is a prime.

It is a super-2 number, since 2×21514331553² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21514331551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 114003 + ... + 236696.

It is an arithmetic number, because the mean of its divisors is an integer number (948409700).

Almost surely, 2^21514331553 is an apocalyptic number.

It is an amenable number.

21514331553 is a deficient number, since it is larger than the sum of its proper divisors (12628417647).

21514331553 is a wasteful number, since it uses less digits than its factorization.

21514331553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350750 (or 350726 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The spelling of 21514331553 in words is "twenty-one billion, five hundred fourteen million, three hundred thirty-one thousand, five hundred fifty-three".