21199570 has 16 divisors (see below), whose sum is σ = 43610688. Its totient is φ = 7268400.

The previous prime is 21199547. The next prime is 21199579. The reversal of 21199570 is 7599112.

It is not an unprimeable number, because it can be changed into a prime (21199579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151356 + ... + 151495.

It is an arithmetic number, because the mean of its divisors is an integer number (2725668).

Almost surely, 2^21199570 is an apocalyptic number.

21199570 is an abundant number, since it is smaller than the sum of its proper divisors (22411118).

21199570 is a wasteful number, since it uses less digits than its factorization.

21199570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302865.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 21199570 is about 4604.2990780357. The cubic root of 21199570 is about 276.7636295029.

The spelling of 21199570 in words is "twenty-one million, one hundred ninety-nine thousand, five hundred seventy".