21456522 has 32 divisors (see below), whose sum is σ = 48974400. Its totient is φ = 6958224.

The previous prime is 21456521. The next prime is 21456563. The reversal of 21456522 is 22565412.

21456522 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 652 + 2 = 666.

It is a super-5 number, since 5×21456522⁵ (a number of 38 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21456521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3372 + ... + 7367.

It is an arithmetic number, because the mean of its divisors is an integer number (1530450).

Almost surely, 2^21456522 is an apocalyptic number.

21456522 is an abundant number, since it is smaller than the sum of its proper divisors (27517878).

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

21456522 is a wasteful number, since it uses less digits than its factorization.

21456522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10787 (or 10781 counting only the distinct ones).

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

The square root of 21456522 is about 4632.1185217997. The cubic root of 21456522 is about 277.8773245465.

The spelling of 21456522 in words is "twenty-one million, four hundred fifty-six thousand, five hundred twenty-two".