21736467519 has 12 divisors (see below), whose sum is σ = 31382829576. Its totient is φ = 13376287392.

The previous prime is 21736467509. The next prime is 21736467547. The reversal of 21736467519 is 91576463712.

It is a de Polignac number, because none of the positive numbers 2^k-21736467519 is a prime.

It is a super-2 number, since 2×21736467519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21736467509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21435852 + ... + 21436865.

It is an arithmetic number, because the mean of its divisors is an integer number (2615235798).

Almost surely, 2^21736467519 is an apocalyptic number.

21736467519 is a deficient number, since it is larger than the sum of its proper divisors (9646362057).

21736467519 is a wasteful number, since it uses less digits than its factorization.

21736467519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42872746 (or 42872733 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The spelling of 21736467519 in words is "twenty-one billion, seven hundred thirty-six million, four hundred sixty-seven thousand, five hundred nineteen".