21021327360 has 560 divisors, whose sum is σ = 82518658200. Its totient is φ = 5096079360.

The previous prime is 21021327359. The next prime is 21021327361. The reversal of 21021327360 is 6372312012.

It is an interprime number because it is at equal distance from previous prime (21021327359) and next prime (21021327361).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021327361) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1911029755 + ... + 1911029765.

Almost surely, 2^21021327360 is an apocalyptic number.

21021327360 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 21021327360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41259329100).

21021327360 is an abundant number, since it is smaller than the sum of its proper divisors (61497330840).

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

21021327360 is an frugal number, since it uses more digits than its factorization.

21021327360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

Adding to 21021327360 its reverse (6372312012), we get a palindrome (27393639372).

The spelling of 21021327360 in words is "twenty-one billion, twenty-one million, three hundred twenty-seven thousand, three hundred sixty".