21345996 has 24 divisors (see below), whose sum is σ = 56922880. Its totient is φ = 6098832.

The previous prime is 21345983. The next prime is 21345997. The reversal of 21345996 is 69954312.

It is not an unprimeable number, because it can be changed into a prime (21345997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126976 + ... + 127143.

Almost surely, 2^21345996 is an apocalyptic number.

It is an amenable number.

21345996 is an abundant number, since it is smaller than the sum of its proper divisors (35576884).

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

21345996 is a wasteful number, since it uses less digits than its factorization.

21345996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254133 (or 254131 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 21345996 is about 4620.1727240440. The cubic root of 21345996 is about 277.3993726537.

The spelling of 21345996 in words is "twenty-one million, three hundred forty-five thousand, nine hundred ninety-six".