23021145 has 64 divisors (see below), whose sum is σ = 49559040. Its totient is φ = 9897984.

The previous prime is 23021101. The next prime is 23021147. The reversal of 23021145 is 54112032.

It is not a de Polignac number, because 23021145 - 2⁸ = 23020889 is a prime.

It is a super-2 number, since 2×23021145² = 1059946234222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23021147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15349 + ... + 16781.

It is an arithmetic number, because the mean of its divisors is an integer number (774360).

Almost surely, 2^23021145 is an apocalyptic number.

It is an amenable number.

23021145 is an abundant number, since it is smaller than the sum of its proper divisors (26537895).

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

23021145 is a wasteful number, since it uses less digits than its factorization.

23021145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 23021145 is about 4798.0355355083. The cubic root of 23021145 is about 284.4738213892.

Adding to 23021145 its reverse (54112032), we get a palindrome (77133177).

The spelling of 23021145 in words is "twenty-three million, twenty-one thousand, one hundred forty-five".