21373192 has 8 divisors (see below), whose sum is σ = 40074750. Its totient is φ = 10686592.

The previous prime is 21373171. The next prime is 21373207. The reversal of 21373192 is 29137312.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 1069156 = 4506^2 + 1034^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21373192.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335817 + ... + 1335832.

Almost surely, 2^21373192 is an apocalyptic number.

It is an amenable number.

21373192 is a deficient number, since it is larger than the sum of its proper divisors (18701558).

21373192 is a wasteful number, since it uses less digits than its factorization.

21373192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671655 (or 2671651 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 21373192 is about 4623.1149672056. The cubic root of 21373192 is about 277.5171301278.

It can be divided in two parts, 2137 and 3192, that added together give a square (5329 = 73²).

The spelling of 21373192 in words is "twenty-one million, three hundred seventy-three thousand, one hundred ninety-two".