21716340751 has 16 divisors (see below), whose sum is σ = 25632921600. Its totient is φ = 18003961440.

The previous prime is 21716340749. The next prime is 21716340797. The reversal of 21716340751 is 15704361712.

It is a cyclic number.

It is not a de Polignac number, because 21716340751 - 2¹ = 21716340749 is a prime.

It is a super-2 number, since 2×21716340751² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21716340751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716340851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397260 + ... + 448606.

It is an arithmetic number, because the mean of its divisors is an integer number (1602057600).

Almost surely, 2^21716340751 is an apocalyptic number.

21716340751 is a deficient number, since it is larger than the sum of its proper divisors (3916580849).

21716340751 is a wasteful number, since it uses less digits than its factorization.

21716340751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53334.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21716340751 in words is "twenty-one billion, seven hundred sixteen million, three hundred forty thousand, seven hundred fifty-one".