21336361720 has 64 divisors (see below), whose sum is σ = 48928665600. Its totient is φ = 8371735680.

The previous prime is 21336361693. The next prime is 21336361763. The reversal of 21336361720 is 2716363312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623865 + ... + 657175.

It is an arithmetic number, because the mean of its divisors is an integer number (764510400).

Almost surely, 2^21336361720 is an apocalyptic number.

21336361720 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 21336361720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24464332800).

21336361720 is an abundant number, since it is smaller than the sum of its proper divisors (27592303880).

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

21336361720 is a wasteful number, since it uses less digits than its factorization.

21336361720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33628 (or 33624 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 34.

The spelling of 21336361720 in words is "twenty-one billion, three hundred thirty-six million, three hundred sixty-one thousand, seven hundred twenty".