15421544144 has 10 divisors (see below), whose sum is σ = 29879241810. Its totient is φ = 7710772064.

The previous prime is 15421544113. The next prime is 15421544147. The reversal of 15421544144 is 44144512451.

It can be written as a sum of positive squares in only one way, i.e., 12463489600 + 2958054544 = 111640^2 + 54388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421544147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 481923239 + ... + 481923270.

It is an arithmetic number, because the mean of its divisors is an integer number (2987924181).

Almost surely, 2^15421544144 is an apocalyptic number.

It is an amenable number.

15421544144 is a deficient number, since it is larger than the sum of its proper divisors (14457697666).

15421544144 is an equidigital number, since it uses as much as digits as its factorization.

15421544144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963846517 (or 963846511 counting only the distinct ones).

The product of its digits is 51200, while the sum is 35.

The spelling of 15421544144 in words is "fifteen billion, four hundred twenty-one million, five hundred forty-four thousand, one hundred forty-four".