21373270016 has 144 divisors (see below), whose sum is σ = 49934004120. Its totient is φ = 9119416320.

The previous prime is 21373270001. The next prime is 21373270027. The reversal of 21373270016 is 61007237312.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37431011 + ... + 37431581.

Almost surely, 2^21373270016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21373270016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24967002060).

21373270016 is an abundant number, since it is smaller than the sum of its proper divisors (28560734104).

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

21373270016 is an equidigital number, since it uses as much as digits as its factorization.

21373270016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The spelling of 21373270016 in words is "twenty-one billion, three hundred seventy-three million, two hundred seventy thousand, sixteen".