23021651 has 4 divisors (see below), whose sum is σ = 23039400. Its totient is φ = 23003904.

The previous prime is 23021639. The next prime is 23021653. The reversal of 23021651 is 15612032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23021651 - 2¹⁸ = 22759507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23021653) 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 3 ways as a sum of consecutive naturals, for example, 6761 + ... + 9578.

It is an arithmetic number, because the mean of its divisors is an integer number (5759850).

Almost surely, 2^23021651 is an apocalyptic number.

23021651 is a deficient number, since it is larger than the sum of its proper divisors (17749).

23021651 is a wasteful number, since it uses less digits than its factorization.

23021651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17748.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 23021651 is about 4798.0882651323. The cubic root of 23021651 is about 284.4759055992.

Adding to 23021651 its reverse (15612032), we get a palindrome (38633683).

The spelling of 23021651 in words is "twenty-three million, twenty-one thousand, six hundred fifty-one".