21492970 has 16 divisors (see below), whose sum is σ = 38750688. Its totient is φ = 8583120.

The previous prime is 21492953. The next prime is 21493007. The reversal of 21492970 is 7929412.

It is a happy 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, 6505 + ... + 9235.

It is an arithmetic number, because the mean of its divisors is an integer number (2421918).

Almost surely, 2^21492970 is an apocalyptic number.

21492970 is a deficient number, since it is larger than the sum of its proper divisors (17257718).

21492970 is a wasteful number, since it uses less digits than its factorization.

21492970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21492970 is about 4636.0511213747. The cubic root of 21492970 is about 278.0345781050.

The spelling of 21492970 in words is "twenty-one million, four hundred ninety-two thousand, nine hundred seventy".