12921970 has 16 divisors (see below), whose sum is σ = 23827608. Its totient is φ = 5042560.

The previous prime is 12921967. The next prime is 12922001. The reversal of 12921970 is 7912921.

It can be written as a sum of positive squares in 4 ways, for example, as 4272489 + 8649481 = 2067^2 + 2941^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15349 + ... + 16168.

Almost surely, 2^12921970 is an apocalyptic number.

12921970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12921970 is a deficient number, since it is larger than the sum of its proper divisors (10905638).

12921970 is a wasteful number, since it uses less digits than its factorization.

12921970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31565.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12921970 is about 3594.7141750075. The cubic root of 12921970 is about 234.6620765538.

The spelling of 12921970 in words is "twelve million, nine hundred twenty-one thousand, nine hundred seventy".