21672672505 has 32 divisors (see below), whose sum is σ = 28539423360. Its totient is φ = 15668920320.

The previous prime is 21672672499. The next prime is 21672672509. The reversal of 21672672505 is 50527627612.

It is not a de Polignac number, because 21672672505 - 2¹¹ = 21672670457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21672672509) 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, 8748327 + ... + 8750803.

It is an arithmetic number, because the mean of its divisors is an integer number (891856980).

Almost surely, 2^21672672505 is an apocalyptic number.

It is an amenable number.

21672672505 is a deficient number, since it is larger than the sum of its proper divisors (6866750855).

21672672505 is a wasteful number, since it uses less digits than its factorization.

21672672505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 21672672505 in words is "twenty-one billion, six hundred seventy-two million, six hundred seventy-two thousand, five hundred five".