15449885121 has 24 divisors (see below), whose sum is σ = 23373236992. Its totient is φ = 9061509600.

The previous prime is 15449885119. The next prime is 15449885123. The reversal of 15449885121 is 12158894451.

It is an interprime number because it is at equal distance from previous prime (15449885119) and next prime (15449885123).

It is not a de Polignac number, because 15449885121 - 2¹ = 15449885119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15449885123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 675226 + ... + 697731.

Almost surely, 2^15449885121 is an apocalyptic number.

15449885121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15449885121 is a deficient number, since it is larger than the sum of its proper divisors (7923351871).

15449885121 is a wasteful number, since it uses less digits than its factorization.

15449885121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373013 (or 1373002 counting only the distinct ones).

The product of its digits is 460800, while the sum is 48.

The spelling of 15449885121 in words is "fifteen billion, four hundred forty-nine million, eight hundred eighty-five thousand, one hundred twenty-one".