21362490 has 24 divisors (see below), whose sum is σ = 55542708. Its totient is φ = 5696640.

The previous prime is 21362477. The next prime is 21362513. The reversal of 21362490 is 9426312.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 4247721 = 4137^2 + 2061^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118591 + ... + 118770.

Almost surely, 2^21362490 is an apocalyptic number.

21362490 is an abundant number, since it is smaller than the sum of its proper divisors (34180218).

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

21362490 is a wasteful number, since it uses less digits than its factorization.

21362490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237374 (or 237371 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21362490 is about 4621.9573775620. The cubic root of 21362490 is about 277.4708028692.

The spelling of 21362490 in words is "twenty-one million, three hundred sixty-two thousand, four hundred ninety".