23087021 has 4 divisors (see below), whose sum is σ = 23204412. Its totient is φ = 22969632.

The previous prime is 23087017. The next prime is 23087083. The reversal of 23087021 is 12078032.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 10562500 = 3539^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 23087021 - 2² = 23087017 is a prime.

It is a super-3 number, since 3×23087021³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23087221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58400 + ... + 58793.

It is an arithmetic number, because the mean of its divisors is an integer number (5801103).

Almost surely, 2^23087021 is an apocalyptic number.

It is an amenable number.

23087021 is a deficient number, since it is larger than the sum of its proper divisors (117391).

23087021 is a wasteful number, since it uses less digits than its factorization.

23087021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117390.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 23087021 is about 4804.8955243585. The cubic root of 23087021 is about 284.7449076843.

The spelling of 23087021 in words is "twenty-three million, eighty-seven thousand, twenty-one".