15444821412 has 18 divisors (see below), whose sum is σ = 39041076438. Its totient is φ = 5148273792.

The previous prime is 15444821407. The next prime is 15444821437. The reversal of 15444821412 is 21412844451.

15444821412 is a `hidden beast` number, since 154 + 4 + 482 + 14 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12722486436 + 2722334976 = 112794^2 + 52176^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 429022817 = 15444821412 / (1 + 5 + 4 + 4 + 4 + 8 + 2 + 1 + 4 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214511373 + ... + 214511444.

It is an arithmetic number, because the mean of its divisors is an integer number (2168948691).

Almost surely, 2^15444821412 is an apocalyptic number.

15444821412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15444821412 is an abundant number, since it is smaller than the sum of its proper divisors (23596255026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15444821412 is a wasteful number, since it uses less digits than its factorization.

15444821412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429022827 (or 429022822 counting only the distinct ones).

The product of its digits is 40960, while the sum is 36.

The spelling of 15444821412 in words is "fifteen billion, four hundred forty-four million, eight hundred twenty-one thousand, four hundred twelve".