21036157236 has 36 divisors (see below), whose sum is σ = 55486677792. Its totient is φ = 6707180304.

The previous prime is 21036157189. The next prime is 21036157271. The reversal of 21036157236 is 63275163012.

21036157236 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 615 + 7 + 2 + 36 = 666.

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

It is a super-2 number, since 2×21036157236² (a number of 21 digits) contains 22 as substring.

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 21036157236.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12702166 + ... + 12703821.

Almost surely, 2^21036157236 is an apocalyptic number.

It is an amenable number.

21036157236 is an abundant number, since it is smaller than the sum of its proper divisors (34450520556).

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

21036157236 is a wasteful number, since it uses less digits than its factorization.

21036157236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25406020 (or 25406015 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 21036157236 in words is "twenty-one billion, thirty-six million, one hundred fifty-seven thousand, two hundred thirty-six".