23021955 has 64 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 10834560.

The previous prime is 23021953. The next prime is 23021983. The reversal of 23021955 is 55912032.

It is not a de Polignac number, because 23021955 - 2¹ = 23021953 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (23021953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54736 + ... + 55154.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^23021955 is an apocalyptic number.

23021955 is a deficient number, since it is larger than the sum of its proper divisors (22942845).

23021955 is a wasteful number, since it uses less digits than its factorization.

23021955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 23021955 is about 4798.1199443115. The cubic root of 23021955 is about 284.4771577581.

Adding to 23021955 its reverse (55912032), we get a palindrome (78933987).

The spelling of 23021955 in words is "twenty-three million, twenty-one thousand, nine hundred fifty-five".