21366136 has 16 divisors (see below), whose sum is σ = 43703640. Its totient is φ = 9711840.

The previous prime is 21366133. The next prime is 21366139. The reversal of 21366136 is 63166312.

It is an interprime number because it is at equal distance from previous prime (21366133) and next prime (21366139).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121311 + ... + 121486.

Almost surely, 2^21366136 is an apocalyptic number.

It is an amenable number.

21366136 is an abundant number, since it is smaller than the sum of its proper divisors (22337504).

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

21366136 is a wasteful number, since it uses less digits than its factorization.

21366136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242814 (or 242810 counting only the distinct ones).

The product of its digits is 3888, while the sum is 28.

The square root of 21366136 is about 4622.3517823723. The cubic root of 21366136 is about 277.4865875616.

The spelling of 21366136 in words is "twenty-one million, three hundred sixty-six thousand, one hundred thirty-six".