402563021 has 4 divisors (see below), whose sum is σ = 460072032. Its totient is φ = 345054012.

The previous prime is 402563017. The next prime is 402563027. The reversal of 402563021 is 120365204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402563021 - 2² = 402563017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402563027) 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, 28754495 + ... + 28754508.

It is an arithmetic number, because the mean of its divisors is an integer number (115018008).

Almost surely, 2^402563021 is an apocalyptic number.

It is an amenable number.

402563021 is a deficient number, since it is larger than the sum of its proper divisors (57509011).

402563021 is an equidigital number, since it uses as much as digits as its factorization.

402563021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57509010.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 402563021 is about 20063.9732107078. The cubic root of 402563021 is about 738.3766587853.

The spelling of 402563021 in words is "four hundred two million, five hundred sixty-three thousand, twenty-one".