23313213021 has 16 divisors (see below), whose sum is σ = 35601971328. Its totient is φ = 13292932800.

The previous prime is 23313213019. The next prime is 23313213029. The reversal of 23313213021 is 12031231332.

It is not a de Polignac number, because 23313213021 - 2¹ = 23313213019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23313213029) 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, 1194390 + ... + 1213751.

It is an arithmetic number, because the mean of its divisors is an integer number (2225123208).

Almost surely, 2^23313213021 is an apocalyptic number.

23313213021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23313213021 is a deficient number, since it is larger than the sum of its proper divisors (12288758307).

23313213021 is a wasteful number, since it uses less digits than its factorization.

23313213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408612.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 23313213021 its reverse (12031231332), we get a palindrome (35344444353).

The spelling of 23313213021 in words is "twenty-three billion, three hundred thirteen million, two hundred thirteen thousand, twenty-one".