21321157838752 has 48 divisors (see below), whose sum is σ = 42490036149120. Its totient is φ = 10530087565312.

The previous prime is 21321157838749. The next prime is 21321157838797. The reversal of 21321157838752 is 25783875112312.

It is a junction number, because it is equal to n+sod(n) for n = 21321157838693 and 21321157838702.

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, 12907449 + ... + 14465287.

It is an arithmetic number, because the mean of its divisors is an integer number (885209086440).

Almost surely, 2^{21321157838752} is an apocalyptic number.

It is an amenable number.

21321157838752 is a deficient number, since it is larger than the sum of its proper divisors (21168878310368).

21321157838752 is a wasteful number, since it uses less digits than its factorization.

21321157838752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563085 (or 1563077 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 55.

The spelling of 21321157838752 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred fifty-seven million, eight hundred thirty-eight thousand, seven hundred fifty-two".