23021216 has 12 divisors (see below), whose sum is σ = 45323082. Its totient is φ = 11510592.

The previous prime is 23021203. The next prime is 23021227. The reversal of 23021216 is 61212032.

It can be written as a sum of positive squares in only one way, i.e., 23001616 + 19600 = 4796^2 + 140^2 .

It is a super-2 number, since 2×23021216² = 1059952772237312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23021194 and 23021203.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359675 + ... + 359738.

Almost surely, 2^23021216 is an apocalyptic number.

It is an amenable number.

23021216 is a deficient number, since it is larger than the sum of its proper divisors (22301866).

23021216 is an equidigital number, since it uses as much as digits as its factorization.

23021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719423 (or 719415 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 23021216 is about 4798.0429343640. The cubic root of 23021216 is about 284.4741138395.

Adding to 23021216 its reverse (61212032), we get a palindrome (84233248).

The spelling of 23021216 in words is "twenty-three million, twenty-one thousand, two hundred sixteen".