21160970 has 8 divisors (see below), whose sum is σ = 38089764. Its totient is φ = 8464384.

The previous prime is 21160969. The next prime is 21160973. The reversal of 21160970 is 7906112.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 28561 = 4597^2 + 169^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21160973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058039 + ... + 1058058.

Almost surely, 2^21160970 is an apocalyptic number.

21160970 is a deficient number, since it is larger than the sum of its proper divisors (16928794).

21160970 is a wasteful number, since it uses less digits than its factorization.

21160970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116104.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21160970 is about 4600.1054335743. The cubic root of 21160970 is about 276.5955511480.

The spelling of 21160970 in words is "twenty-one million, one hundred sixty thousand, nine hundred seventy".