21174969 has 16 divisors (see below), whose sum is σ = 28978560. Its totient is φ = 13749120.

The previous prime is 21174961. The next prime is 21174977. The reversal of 21174969 is 96947112.

It is an interprime number because it is at equal distance from previous prime (21174961) and next prime (21174977).

It is not a de Polignac number, because 21174969 - 2³ = 21174961 is a prime.

It is a super-2 number, since 2×21174969² = 896758624301922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21174961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18399 + ... + 19515.

It is an arithmetic number, because the mean of its divisors is an integer number (1811160).

Almost surely, 2^21174969 is an apocalyptic number.

It is an amenable number.

21174969 is a deficient number, since it is larger than the sum of its proper divisors (7803591).

21174969 is a wasteful number, since it uses less digits than its factorization.

21174969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its digits is 27216, while the sum is 39.

The square root of 21174969 is about 4601.6267775646. The cubic root of 21174969 is about 276.6565314589.

The spelling of 21174969 in words is "twenty-one million, one hundred seventy-four thousand, nine hundred sixty-nine".