21470965 has 8 divisors (see below), whose sum is σ = 25790040. Its totient is φ = 17160192.

The previous prime is 21470959. The next prime is 21470971. The reversal of 21470965 is 56907412.

It is an interprime number because it is at equal distance from previous prime (21470959) and next prime (21470971).

It can be written as a sum of positive squares in 4 ways, for example, as 3006756 + 18464209 = 1734^2 + 4297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21470965 - 2³ = 21470957 is a prime.

It is a super-2 number, since 2×21470965² = 922004676062450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21470965.

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, 9021 + ... + 11149.

It is an arithmetic number, because the mean of its divisors is an integer number (3223755).

Almost surely, 2^21470965 is an apocalyptic number.

It is an amenable number.

21470965 is a deficient number, since it is larger than the sum of its proper divisors (4319075).

21470965 is a wasteful number, since it uses less digits than its factorization.

21470965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21470965 is about 4633.6772654124. The cubic root of 21470965 is about 277.9396596262.

The spelling of 21470965 in words is "twenty-one million, four hundred seventy thousand, nine hundred sixty-five".