21371796 has 24 divisors (see below), whose sum is σ = 55408640. Its totient is φ = 7123896.

The previous prime is 21371767. The next prime is 21371797. The reversal of 21371796 is 69717312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21371796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98836 + ... + 99051.

Almost surely, 2^21371796 is an apocalyptic number.

It is an amenable number.

21371796 is an abundant number, since it is smaller than the sum of its proper divisors (34036844).

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

21371796 is a wasteful number, since it uses less digits than its factorization.

21371796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197900 (or 197892 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 21371796 is about 4622.9639842854. The cubic root of 21371796 is about 277.5110879426.

The spelling of 21371796 in words is "twenty-one million, three hundred seventy-one thousand, seven hundred ninety-six".