21402292 has 6 divisors (see below), whose sum is σ = 37454018. Its totient is φ = 10701144.

The previous prime is 21402289. The next prime is 21402299. The reversal of 21402292 is 29220412.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 6687396 = 3836^2 + 2586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675283 + ... + 2675290.

Almost surely, 2^21402292 is an apocalyptic number.

It is an amenable number.

21402292 is a deficient number, since it is larger than the sum of its proper divisors (16051726).

21402292 is a wasteful number, since it uses less digits than its factorization.

21402292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350577 (or 5350575 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21402292 is about 4626.2611253581. The cubic root of 21402292 is about 277.6430212622.

The spelling of 21402292 in words is "twenty-one million, four hundred two thousand, two hundred ninety-two".