21369068624 has 10 divisors (see below), whose sum is σ = 41402570490. Its totient is φ = 10684534304.

The previous prime is 21369068621. The next prime is 21369068647. The reversal of 21369068624 is 42686096312.

It can be written as a sum of positive squares in only one way, i.e., 10698178624 + 10670890000 = 103432^2 + 103300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369068621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667783379 + ... + 667783410.

It is an arithmetic number, because the mean of its divisors is an integer number (4140257049).

Almost surely, 2^21369068624 is an apocalyptic number.

It is an amenable number.

21369068624 is a deficient number, since it is larger than the sum of its proper divisors (20033501866).

21369068624 is a wasteful number, since it uses less digits than its factorization.

21369068624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335566797 (or 1335566791 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 21369068624 in words is "twenty-one billion, three hundred sixty-nine million, sixty-eight thousand, six hundred twenty-four".