21512789383 has 4 divisors (see below), whose sum is σ = 22778247600. Its totient is φ = 20247331168.

The previous prime is 21512789323. The next prime is 21512789393. The reversal of 21512789383 is 38398721512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21512789383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512789303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632729083 + ... + 632729116.

It is an arithmetic number, because the mean of its divisors is an integer number (5694561900).

Almost surely, 2^21512789383 is an apocalyptic number.

21512789383 is a deficient number, since it is larger than the sum of its proper divisors (1265458217).

21512789383 is a wasteful number, since it uses less digits than its factorization.

21512789383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265458216.

The product of its digits is 725760, while the sum is 49.

The spelling of 21512789383 in words is "twenty-one billion, five hundred twelve million, seven hundred eighty-nine thousand, three hundred eighty-three".