23021553402 has 64 divisors (see below), whose sum is σ = 52806624000. Its totient is φ = 7428801600.

The previous prime is 23021553389. The next prime is 23021553413. The reversal of 23021553402 is 20435512032.

It is a happy number.

23021553402 is a `hidden beast` number, since 2 + 302 + 15 + 5 + 340 + 2 = 666.

It is a super-2 number, since 2×23021553402² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368652 + ... + 426552.

It is an arithmetic number, because the mean of its divisors is an integer number (825103500).

Almost surely, 2^23021553402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23021553402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26403312000).

23021553402 is an abundant number, since it is smaller than the sum of its proper divisors (29785070598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23021553402 is a wasteful number, since it uses less digits than its factorization.

23021553402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58148 (or 58142 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 23021553402 in words is "twenty-three billion, twenty-one million, five hundred fifty-three thousand, four hundred two".