21992502 has 16 divisors (see below), whose sum is σ = 50268672. Its totient is φ = 6283560.

The previous prime is 21992501. The next prime is 21992521. The reversal of 21992502 is 20529912.

It is a self number, because there is not a number n which added to its sum of digits gives 21992502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261774 + ... + 261857.

It is an arithmetic number, because the mean of its divisors is an integer number (3141792).

Almost surely, 2^21992502 is an apocalyptic number.

21992502 is an abundant number, since it is smaller than the sum of its proper divisors (28276170).

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

21992502 is a wasteful number, since it uses less digits than its factorization.

21992502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523643.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21992502 is about 4689.6164022231. The cubic root of 21992502 is about 280.1720965834.

The spelling of 21992502 in words is "twenty-one million, nine hundred ninety-two thousand, five hundred two".