21020192 has 24 divisors (see below), whose sum is σ = 41633676. Its totient is φ = 10446592.

The previous prime is 21020161. The next prime is 21020227. The reversal of 21020192 is 29102012.

It can be written as a sum of positive squares in 2 ways, for example, as 20830096 + 190096 = 4564^2 + 436^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21020192.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3638 + ... + 7434.

Almost surely, 2^21020192 is an apocalyptic number.

It is an amenable number.

21020192 is a deficient number, since it is larger than the sum of its proper divisors (20613484).

21020192 is a wasteful number, since it uses less digits than its factorization.

21020192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3980 (or 3972 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21020192 is about 4584.7782934402. The cubic root of 21020192 is about 275.9808150216.

It can be divided in two parts, 21020 and 192, that added together give a palindrome (21212).

The spelling of 21020192 in words is "twenty-one million, twenty thousand, one hundred ninety-two".