465540021 has 8 divisors (see below), whose sum is σ = 689688960. Its totient is φ = 310359996.

The previous prime is 465540001. The next prime is 465540041. The reversal of 465540021 is 120045564.

465540021 is a `hidden beast` number, since 4 + 655 + 4 + 0 + 0 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (465540001) and next prime (465540041).

It is not a de Polignac number, because 465540021 - 2¹⁴ = 465523637 is a prime.

It is a super-2 number, since 2×465540021² = 433455022305360882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 17242223 = 465540021 / (4 + 6 + 5 + 5 + 4 + 0 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (465540001) 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, 8621085 + ... + 8621138.

It is an arithmetic number, because the mean of its divisors is an integer number (86211120).

Almost surely, 2^465540021 is an apocalyptic number.

It is an amenable number.

465540021 is a deficient number, since it is larger than the sum of its proper divisors (224148939).

465540021 is a wasteful number, since it uses less digits than its factorization.

465540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17242232 (or 17242226 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 465540021 is about 21576.3764566713. The cubic root of 465540021 is about 775.0308810449.

Adding to 465540021 its reverse (120045564), we get a palindrome (585585585).

The spelling of 465540021 in words is "four hundred sixty-five million, five hundred forty thousand, twenty-one".