21386196 has 36 divisors (see below), whose sum is σ = 58219252. Its totient is φ = 6580224.

The previous prime is 21386149. The next prime is 21386203. The reversal of 21386196 is 69168312.

21386196 is a `hidden beast` number, since 2 + 1 + 38 + 619 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 16160400 = 2286^2 + 4020^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 21386196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22381 + ... + 23316.

Almost surely, 2^21386196 is an apocalyptic number.

21386196 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21386196 is an abundant number, since it is smaller than the sum of its proper divisors (36833056).

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

21386196 is a wasteful number, since it uses less digits than its factorization.

21386196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45720 (or 45715 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21386196 is about 4624.5211644018. The cubic root of 21386196 is about 277.5734015714.

The spelling of 21386196 in words is "twenty-one million, three hundred eighty-six thousand, one hundred ninety-six".