21313892 has 12 divisors (see below), whose sum is σ = 37403520. Its totient is φ = 10627176.

The previous prime is 21313867. The next prime is 21313909. The reversal of 21313892 is 29831312.

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 3 ways as a sum of consecutive naturals, for example, 5792 + ... + 8727.

It is an arithmetic number, because the mean of its divisors is an integer number (3116960).

Almost surely, 2^21313892 is an apocalyptic number.

It is an amenable number.

21313892 is a deficient number, since it is larger than the sum of its proper divisors (16089628).

21313892 is a wasteful number, since it uses less digits than its factorization.

21313892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14890 (or 14888 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 21313892 is about 4616.6970877457. The cubic root of 21313892 is about 277.2602349620.

The spelling of 21313892 in words is "twenty-one million, three hundred thirteen thousand, eight hundred ninety-two".