21310296 has 48 divisors (see below), whose sum is σ = 61977240. Its totient is φ = 6088320.

The previous prime is 21310279. The next prime is 21310297. The reversal of 21310296 is 69201312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310297) 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 in 11 ways as a sum of consecutive naturals, for example, 7885 + ... + 10236.

Almost surely, 2^21310296 is an apocalyptic number.

It is an amenable number.

21310296 is an abundant number, since it is smaller than the sum of its proper divisors (40666944).

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

21310296 is a wasteful number, since it uses less digits than its factorization.

21310296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18144 (or 18133 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21310296 is about 4616.3076154000. The cubic root of 21310296 is about 277.2446413157.

The spelling of 21310296 in words is "twenty-one million, three hundred ten thousand, two hundred ninety-six".