21136068 has 36 divisors (see below), whose sum is σ = 53965548. Its totient is φ = 6974400.

The previous prime is 21136067. The next prime is 21136069. The reversal of 21136068 is 86063112.

It is an interprime number because it is at equal distance from previous prime (21136067) and next prime (21136069).

It can be written as a sum of positive squares in 2 ways, for example, as 18045504 + 3090564 = 4248^2 + 1758^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21136067) 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, 730 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (1499043).

Almost surely, 2^21136068 is an apocalyptic number.

It is an amenable number.

21136068 is an abundant number, since it is smaller than the sum of its proper divisors (32829480).

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

21136068 is a wasteful number, since it uses less digits than its factorization.

21136068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5924 (or 5919 counting only the distinct ones).

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

The square root of 21136068 is about 4597.3979597159. The cubic root of 21136068 is about 276.4870103454.

The spelling of 21136068 in words is "twenty-one million, one hundred thirty-six thousand, sixty-eight".