21582238412 has 24 divisors (see below), whose sum is σ = 45703564704. Its totient is φ = 8705440512.

The previous prime is 21582238399. The next prime is 21582238477. The reversal of 21582238412 is 21483228512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22669943 + ... + 22670894.

It is an arithmetic number, because the mean of its divisors is an integer number (1904315196).

Almost surely, 2^21582238412 is an apocalyptic number.

It is an amenable number.

21582238412 is an abundant number, since it is smaller than the sum of its proper divisors (24121326292).

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

21582238412 is a wasteful number, since it uses less digits than its factorization.

21582238412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45340865 (or 45340863 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The spelling of 21582238412 in words is "twenty-one billion, five hundred eighty-two million, two hundred thirty-eight thousand, four hundred twelve".