21422764 has 48 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 9253440.

The previous prime is 21422743. The next prime is 21422783. The reversal of 21422764 is 46722412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131347 + ... + 131509.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^21422764 is an apocalyptic number.

It is an amenable number.

21422764 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21422764 is a wasteful number, since it uses less digits than its factorization.

21422764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 308 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 21422764 is about 4628.4731823788. The cubic root of 21422764 is about 277.7315179617.

The spelling of 21422764 in words is "twenty-one million, four hundred twenty-two thousand, seven hundred sixty-four".