21294816 has 48 divisors (see below), whose sum is σ = 57834000. Its totient is φ = 6852608.

The previous prime is 21294797. The next prime is 21294821. The reversal of 21294816 is 61849212.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (1204875).

Almost surely, 2^21294816 is an apocalyptic number.

It is an amenable number.

21294816 is an abundant number, since it is smaller than the sum of its proper divisors (36539184).

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

21294816 is a wasteful number, since it uses less digits than its factorization.

21294816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7691 (or 7683 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 21294816 is about 4614.6306461081. The cubic root of 21294816 is about 277.1774940135.

The spelling of 21294816 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred sixteen".