15221377422438 has 128 divisors (see below), whose sum is σ = 33571567411200. Its totient is φ = 4562717040000.

The previous prime is 15221377422359. The next prime is 15221377422473. The reversal of 15221377422438 is 83422477312251.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1540152645 + ... + 1540162527.

It is an arithmetic number, because the mean of its divisors is an integer number (262277870400).

Almost surely, 2^{15221377422438} is an apocalyptic number.

15221377422438 is an abundant number, since it is smaller than the sum of its proper divisors (18350189988762).

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

15221377422438 is a wasteful number, since it uses less digits than its factorization.

15221377422438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10778.

The product of its digits is 4515840, while the sum is 51.

The spelling of 15221377422438 in words is "fifteen trillion, two hundred twenty-one billion, three hundred seventy-seven million, four hundred twenty-two thousand, four hundred thirty-eight".