15789249421 has 8 divisors (see below), whose sum is σ = 17625209184. Its totient is φ = 14020051920.

The previous prime is 15789249389. The next prime is 15789249449. The reversal of 15789249421 is 12494298751.

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

It is a cyclic number.

It is not a de Polignac number, because 15789249421 - 2⁵ = 15789249389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15789240421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16690066 + ... + 16691011.

It is an arithmetic number, because the mean of its divisors is an integer number (2203151148).

Almost surely, 2^15789249421 is an apocalyptic number.

15789249421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15789249421 is a deficient number, since it is larger than the sum of its proper divisors (1835959763).

15789249421 is a wasteful number, since it uses less digits than its factorization.

15789249421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33381131.

The product of its digits is 1451520, while the sum is 52.

The spelling of 15789249421 in words is "fifteen billion, seven hundred eighty-nine million, two hundred forty-nine thousand, four hundred twenty-one".