21077364 has 48 divisors (see below), whose sum is σ = 61318656. Its totient is φ = 5474400.

The previous prime is 21077359. The next prime is 21077369. The reversal of 21077364 is 46377012.

It is an interprime number because it is at equal distance from previous prime (21077359) and next prime (21077369).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10482 + ... + 12329.

It is an arithmetic number, because the mean of its divisors is an integer number (1277472).

Almost surely, 2^21077364 is an apocalyptic number.

It is an amenable number.

21077364 is an abundant number, since it is smaller than the sum of its proper divisors (40241292).

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

21077364 is a wasteful number, since it uses less digits than its factorization.

21077364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22836 (or 22834 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21077364 is about 4591.0090394161. The cubic root of 21077364 is about 276.2307983350.

The spelling of 21077364 in words is "twenty-one million, seventy-seven thousand, three hundred sixty-four".