21299489187 has 8 divisors (see below), whose sum is σ = 29003559936. Its totient is φ = 13897538952.

The previous prime is 21299489179. The next prime is 21299489209. The reversal of 21299489187 is 78198499212.

It is a happy number.

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

It is not a de Polignac number, because 21299489187 - 2³ = 21299489179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21299489187.

It is not an unprimeable number, because it can be changed into a prime (21299489137) 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, 75529963 + ... + 75530244.

It is an arithmetic number, because the mean of its divisors is an integer number (3625444992).

Almost surely, 2^21299489187 is an apocalyptic number.

21299489187 is a deficient number, since it is larger than the sum of its proper divisors (7704070749).

21299489187 is a wasteful number, since it uses less digits than its factorization.

21299489187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151060257.

The product of its digits is 5225472, while the sum is 60.

The spelling of 21299489187 in words is "twenty-one billion, two hundred ninety-nine million, four hundred eighty-nine thousand, one hundred eighty-seven".