21071424264 has 96 divisors (see below), whose sum is σ = 58174653600. Its totient is φ = 6306868480.

The previous prime is 21071424259. The next prime is 21071424317. The reversal of 21071424264 is 46242417012.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22250239 + ... + 22251185.

It is an arithmetic number, because the mean of its divisors is an integer number (605985975).

Almost surely, 2^21071424264 is an apocalyptic number.

21071424264 is a gapful number since it is divisible by the number (24) 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 21071424264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29087326800).

21071424264 is an abundant number, since it is smaller than the sum of its proper divisors (37103229336).

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

21071424264 is an equidigital number, since it uses as much as digits as its factorization.

21071424264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The spelling of 21071424264 in words is "twenty-one billion, seventy-one million, four hundred twenty-four thousand, two hundred sixty-four".