21350278320 has 160 divisors (see below), whose sum is σ = 77068495872. Its totient is φ = 4787966976.

The previous prime is 21350278253. The next prime is 21350278337. The reversal of 21350278320 is 2387205312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30852 + ... + 208931.

Almost surely, 2^21350278320 is an apocalyptic number.

21350278320 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 21350278320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38534247936).

21350278320 is an abundant number, since it is smaller than the sum of its proper divisors (55718217552).

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

21350278320 is a wasteful number, since it uses less digits than its factorization.

21350278320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239859 (or 239853 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 21350278320 in words is "twenty-one billion, three hundred fifty million, two hundred seventy-eight thousand, three hundred twenty".