21000332316 has 96 divisors (see below), whose sum is σ = 50363244288. Its totient is φ = 6808965120.

The previous prime is 21000332219. The next prime is 21000332317. The reversal of 21000332316 is 61323300012.

It is a junction number, because it is equal to n+sod(n) for n = 21000332292 and 21000332301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000332317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20567886 + ... + 20568906.

It is an arithmetic number, because the mean of its divisors is an integer number (524617128).

Almost surely, 2^21000332316 is an apocalyptic number.

It is an amenable number.

21000332316 is an abundant number, since it is smaller than the sum of its proper divisors (29362911972).

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

21000332316 is a wasteful number, since it uses less digits than its factorization.

21000332316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21000332316 its reverse (61323300012), we get a palindrome (82323632328).

The spelling of 21000332316 in words is "twenty-one billion, three hundred thirty-two thousand, three hundred sixteen".