21520192 has 14 divisors (see below), whose sum is σ = 42704258. Its totient is φ = 10760064.

The previous prime is 21520189. The next prime is 21520193. The reversal of 21520192 is 29102512.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 8386816 = 3624^2 + 2896^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 168063 + ... + 168190.

Almost surely, 2^21520192 is an apocalyptic number.

It is an amenable number.

21520192 is a deficient number, since it is larger than the sum of its proper divisors (21184066).

21520192 is an equidigital number, since it uses as much as digits as its factorization.

21520192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336265 (or 336255 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21520192 is about 4638.9860961206. The cubic root of 21520192 is about 278.1519104879.

It can be divided in two parts, 21520 and 192, that added together give a palindrome (21712).

The spelling of 21520192 in words is "twenty-one million, five hundred twenty thousand, one hundred ninety-two".