21320468 has 12 divisors (see below), whose sum is σ = 40180980. Its totient is φ = 9840192.

The previous prime is 21320447. The next prime is 21320479. The reversal of 21320468 is 86402312.

It can be written as a sum of positive squares in 2 ways, for example, as 10679824 + 10640644 = 3268^2 + 3262^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204953 + ... + 205056.

It is an arithmetic number, because the mean of its divisors is an integer number (3348415).

Almost surely, 2^21320468 is an apocalyptic number.

It is an amenable number.

21320468 is a deficient number, since it is larger than the sum of its proper divisors (18860512).

21320468 is a wasteful number, since it uses less digits than its factorization.

21320468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410026 (or 410024 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21320468 is about 4617.4092302935. The cubic root of 21320468 is about 277.2887465047.

The spelling of 21320468 in words is "twenty-one million, three hundred twenty thousand, four hundred sixty-eight".