15974449421 has 8 divisors (see below), whose sum is σ = 18260044224. Its totient is φ = 13689737280.

The previous prime is 15974449411. The next prime is 15974449423. The reversal of 15974449421 is 12494447951.

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 15974449421 - 2¹⁸ = 15974187277 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 15974449421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15974449423) 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, 181415 + ... + 254676.

It is an arithmetic number, because the mean of its divisors is an integer number (2282505528).

Almost surely, 2^15974449421 is an apocalyptic number.

It is an amenable number.

15974449421 is a deficient number, since it is larger than the sum of its proper divisors (2285594803).

15974449421 is an equidigital number, since it uses as much as digits as its factorization.

15974449421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441331.

The product of its digits is 1451520, while the sum is 50.

The spelling of 15974449421 in words is "fifteen billion, nine hundred seventy-four million, four hundred forty-nine thousand, four hundred twenty-one".