21323223023220 has 192 divisors, whose sum is σ = 70574108371200. Its totient is φ = 5326346833920.

The previous prime is 21323223023189. The next prime is 21323223023279. The reversal of 21323223023220 is 2232032232312.

21323223023220 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 32 + 2 + 302 + 322 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3567265 + ... + 7441224.

It is an arithmetic number, because the mean of its divisors is an integer number (367573481100).

Almost surely, 2^{21323223023220} is an apocalyptic number.

21323223023220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323223023220 is an abundant number, since it is smaller than the sum of its proper divisors (49250885347980).

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

21323223023220 is a wasteful number, since it uses less digits than its factorization.

21323223023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11008735 (or 11008727 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21323223023220 its reverse (2232032232312), we get a palindrome (23555255255532).

The spelling of 21323223023220 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty-three million, twenty-three thousand, two hundred twenty".