21475023 has 8 divisors (see below), whose sum is σ = 28657200. Its totient is φ = 14304768.

The previous prime is 21475019. The next prime is 21475043. The reversal of 21475023 is 32057412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21475023 - 2² = 21475019 is a prime.

It is a super-2 number, since 2×21475023² = 922353225701058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21474984 and 21475002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2863 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (3582150).

Almost surely, 2^21475023 is an apocalyptic number.

21475023 is a deficient number, since it is larger than the sum of its proper divisors (7182177).

21475023 is a wasteful number, since it uses less digits than its factorization.

21475023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5961.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21475023 is about 4634.1151258897. The cubic root of 21475023 is about 277.9571686683.

The spelling of 21475023 in words is "twenty-one million, four hundred seventy-five thousand, twenty-three".