21271588912 has 80 divisors (see below), whose sum is σ = 50033797632. Its totient is φ = 8552309760.

The previous prime is 21271588883. The next prime is 21271588931. The reversal of 21271588912 is 21988517212.

It is a super-2 number, since 2×21271588912² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574183 + ... + 610105.

Almost surely, 2^21271588912 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 21271588912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25016898816).

21271588912 is an abundant number, since it is smaller than the sum of its proper divisors (28762208720).

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

21271588912 is a wasteful number, since it uses less digits than its factorization.

21271588912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36266 (or 36260 counting only the distinct ones).

The product of its digits is 161280, while the sum is 46.

The spelling of 21271588912 in words is "twenty-one billion, two hundred seventy-one million, five hundred eighty-eight thousand, nine hundred twelve".