21964833 has 48 divisors (see below), whose sum is σ = 37919232. Its totient is φ = 12096000.

The previous prime is 21964801. The next prime is 21964837. The reversal of 21964833 is 33846912.

21964833 is a `hidden beast` number, since 2 + 1 + 9 + 648 + 3 + 3 = 666.

It is not a de Polignac number, because 21964833 - 2⁵ = 21964801 is a prime.

Its product of digits (31104) is a multiple of the sum of its prime factors (486).

It is not an unprimeable number, because it can be changed into a prime (21964837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51963 + ... + 52383.

It is an arithmetic number, because the mean of its divisors is an integer number (789984).

Almost surely, 2^21964833 is an apocalyptic number.

It is an amenable number.

21964833 is a deficient number, since it is larger than the sum of its proper divisors (15954399).

21964833 is a wasteful number, since it uses less digits than its factorization.

21964833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 483 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 21964833 is about 4686.6654457087. The cubic root of 21964833 is about 280.0545514461.

The spelling of 21964833 in words is "twenty-one million, nine hundred sixty-four thousand, eight hundred thirty-three".