21736714971 has 16 divisors (see below), whose sum is σ = 29774929184. Its totient is φ = 14095067904.

The previous prime is 21736714969. The next prime is 21736714973. The reversal of 21736714971 is 17941763712.

It is an interprime number because it is at equal distance from previous prime (21736714969) and next prime (21736714973).

It is not a de Polignac number, because 21736714971 - 2¹ = 21736714969 is a prime.

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 21736714971.

It is not an unprimeable number, because it can be changed into a prime (21736714973) 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, 345375 + ... + 403431.

It is an arithmetic number, because the mean of its divisors is an integer number (1860933074).

Almost surely, 2^21736714971 is an apocalyptic number.

21736714971 is a deficient number, since it is larger than the sum of its proper divisors (8038214213).

21736714971 is a wasteful number, since it uses less digits than its factorization.

21736714971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61470.

The product of its digits is 444528, while the sum is 48.

The spelling of 21736714971 in words is "twenty-one billion, seven hundred thirty-six million, seven hundred fourteen thousand, nine hundred seventy-one".