21292330 has 32 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 7968000.

The previous prime is 21292309. The next prime is 21292343. The reversal of 21292330 is 3329212.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 42421 + ... + 42919.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^21292330 is an apocalyptic number.

21292330 is a deficient number, since it is larger than the sum of its proper divisors (19531670).

21292330 is a wasteful number, since it uses less digits than its factorization.

21292330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21292330 is about 4614.3612775768. The cubic root of 21292330 is about 277.1667075062.

The spelling of 21292330 in words is "twenty-one million, two hundred ninety-two thousand, three hundred thirty".