21659447388292 has 48 divisors (see below), whose sum is σ = 44833702032000. Its totient is φ = 8958319501824.

The previous prime is 21659447388281. The next prime is 21659447388353. The reversal of 21659447388292 is 29288374495612.

It is a super-3 number, since 3×21659447388292³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 4535742 + ... + 7993237.

It is an arithmetic number, because the mean of its divisors is an integer number (934035459000).

Almost surely, 2^{21659447388292} is an apocalyptic number.

It is an amenable number.

21659447388292 is an abundant number, since it is smaller than the sum of its proper divisors (23174254643708).

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

21659447388292 is a wasteful number, since it uses less digits than its factorization.

21659447388292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12531148 (or 12531146 counting only the distinct ones).

The product of its digits is 418037760, while the sum is 70.

The spelling of 21659447388292 in words is "twenty-one trillion, six hundred fifty-nine billion, four hundred forty-seven million, three hundred eighty-eight thousand, two hundred ninety-two".