21426210239280 has 960 divisors, whose sum is σ = 85565976998400. Its totient is φ = 4421837629440.

The previous prime is 21426210239233. The next prime is 21426210239323. The reversal of 21426210239280 is 8293201262412.

It is a super-2 number, since 2×21426210239280² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2332226847 + ... + 2332236033.

It is an arithmetic number, because the mean of its divisors is an integer number (89131226040).

Almost surely, 2^{21426210239280} is an apocalyptic number.

21426210239280 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 21426210239280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42782988499200).

21426210239280 is an abundant number, since it is smaller than the sum of its proper divisors (64139766759120).

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

21426210239280 is a wasteful number, since it uses less digits than its factorization.

21426210239280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399 (or 9364 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 21426210239280 in words is "twenty-one trillion, four hundred twenty-six billion, two hundred ten million, two hundred thirty-nine thousand, two hundred eighty".