21188372307 has 8 divisors (see below), whose sum is σ = 29014708176. Its totient is φ = 13743808992.

The previous prime is 21188372273. The next prime is 21188372353. The reversal of 21188372307 is 70327388112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21188372307 - 2¹² = 21188368211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21188372357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95443008 + ... + 95443229.

It is an arithmetic number, because the mean of its divisors is an integer number (3626838522).

Almost surely, 2^21188372307 is an apocalyptic number.

21188372307 is a deficient number, since it is larger than the sum of its proper divisors (7826335869).

21188372307 is a wasteful number, since it uses less digits than its factorization.

21188372307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190886277.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 21188372307 in words is "twenty-one billion, one hundred eighty-eight million, three hundred seventy-two thousand, three hundred seven".