21192426 has 24 divisors (see below), whose sum is σ = 46375524. Its totient is φ = 6993600.

The previous prime is 21192403. The next prime is 21192427. The reversal of 21192426 is 62429112.

It can be written as a sum of positive squares in 2 ways, for example, as 17766225 + 3426201 = 4215^2 + 1851^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21192426.

It is not an unprimeable number, because it can be changed into a prime (21192427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4011 + ... + 7646.

Almost surely, 2^21192426 is an apocalyptic number.

21192426 is an abundant number, since it is smaller than the sum of its proper divisors (25183098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21192426 is a wasteful number, since it uses less digits than its factorization.

21192426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11766 (or 11763 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21192426 is about 4603.5232159727. The cubic root of 21192426 is about 276.7325373392.

The spelling of 21192426 in words is "twenty-one million, one hundred ninety-two thousand, four hundred twenty-six".