21516272371 has 32 divisors (see below), whose sum is σ = 24304250880. Its totient is φ = 18878323200.

The previous prime is 21516272347. The next prime is 21516272387. The reversal of 21516272371 is 17327261512.

It is not a de Polignac number, because 21516272371 - 2⁵ = 21516272339 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 21516272371.

It is not an unprimeable number, because it can be changed into a prime (21516272311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29595610 + ... + 29596336.

It is an arithmetic number, because the mean of its divisors is an integer number (759507840).

Almost surely, 2^21516272371 is an apocalyptic number.

21516272371 is a deficient number, since it is larger than the sum of its proper divisors (2787978509).

21516272371 is a wasteful number, since it uses less digits than its factorization.

21516272371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395.

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

The spelling of 21516272371 in words is "twenty-one billion, five hundred sixteen million, two hundred seventy-two thousand, three hundred seventy-one".