21363472736 has 12 divisors (see below), whose sum is σ = 42059337012. Its totient is φ = 10681736352.

The previous prime is 21363472729. The next prime is 21363472759. The reversal of 21363472736 is 63727436312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333804230 + ... + 333804293.

It is an arithmetic number, because the mean of its divisors is an integer number (3504944751).

Almost surely, 2^21363472736 is an apocalyptic number.

It is an amenable number.

21363472736 is a deficient number, since it is larger than the sum of its proper divisors (20695864276).

21363472736 is an equidigital number, since it uses as much as digits as its factorization.

21363472736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667608533 (or 667608525 counting only the distinct ones).

The product of its digits is 762048, while the sum is 44.

The spelling of 21363472736 in words is "twenty-one billion, three hundred sixty-three million, four hundred seventy-two thousand, seven hundred thirty-six".