15173345476421 has 4 divisors (see below), whose sum is σ = 16552740519744. Its totient is φ = 13793950433100.

The previous prime is 15173345476381. The next prime is 15173345476433. The reversal of 15173345476421 is 12467454337151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15173345476421 - 2¹⁰ = 15173345475397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15173345476321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689697521645 + ... + 689697521666.

It is an arithmetic number, because the mean of its divisors is an integer number (4138185129936).

Almost surely, 2^{15173345476421} is an apocalyptic number.

15173345476421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15173345476421 is a deficient number, since it is larger than the sum of its proper divisors (1379395043323).

15173345476421 is a wasteful number, since it uses less digits than its factorization.

15173345476421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379395043322.

The product of its digits is 8467200, while the sum is 53.

The spelling of 15173345476421 in words is "fifteen trillion, one hundred seventy-three billion, three hundred forty-five million, four hundred seventy-six thousand, four hundred twenty-one".