21964970 has 16 divisors (see below), whose sum is σ = 40079880. Its totient is φ = 8665344.

The previous prime is 21964967. The next prime is 21964979. The reversal of 21964970 is 7946912.

It can be written as a sum of positive squares in 4 ways, for example, as 18088009 + 3876961 = 4253^2 + 1969^2 .

It is not an unprimeable number, because it can be changed into a prime (21964979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14315 + ... + 15774.

Almost surely, 2^21964970 is an apocalyptic number.

21964970 is a deficient number, since it is larger than the sum of its proper divisors (18114910).

21964970 is a wasteful number, since it uses less digits than its factorization.

21964970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30169.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 21964970 is about 4686.6800616214. The cubic root of 21964970 is about 280.0551337009.

The spelling of 21964970 in words is "twenty-one million, nine hundred sixty-four thousand, nine hundred seventy".