21313996 has 24 divisors (see below), whose sum is σ = 41094144. Its totient is φ = 9592080.

The previous prime is 21313993. The next prime is 21313997. The reversal of 21313996 is 69931312.

It is not an unprimeable number, because it can be changed into a prime (21313993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (1712256).

Almost surely, 2^21313996 is an apocalyptic number.

It is an amenable number.

21313996 is a deficient number, since it is larger than the sum of its proper divisors (19780148).

21313996 is a wasteful number, since it uses less digits than its factorization.

21313996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821 (or 4819 counting only the distinct ones).

The product of its digits is 8748, while the sum is 34.

The square root of 21313996 is about 4616.7083511957. The cubic root of 21313996 is about 277.2606859201.

The spelling of 21313996 in words is "twenty-one million, three hundred thirteen thousand, nine hundred ninety-six".