21365364700 has 72 divisors (see below), whose sum is σ = 48418900992. Its totient is φ = 8167769280.

The previous prime is 21365364673. The next prime is 21365364707. The reversal of 21365364700 is 746356312.

It is a self number, because there is not a number n which added to its sum of digits gives 21365364700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365364707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3416977 + ... + 3423223.

It is an arithmetic number, because the mean of its divisors is an integer number (672484736).

Almost surely, 2^21365364700 is an apocalyptic number.

21365364700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21365364700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24209450496).

21365364700 is an abundant number, since it is smaller than the sum of its proper divisors (27053536292).

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

21365364700 is a wasteful number, since it uses less digits than its factorization.

21365364700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771 (or 7764 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 21365364700 in words is "twenty-one billion, three hundred sixty-five million, three hundred sixty-four thousand, seven hundred".