18771425321 has 16 divisors (see below), whose sum is σ = 21417965568. Its totient is φ = 16285011600.

The previous prime is 18771425317. The next prime is 18771425339. The reversal of 18771425321 is 12352417781.

It is not a de Polignac number, because 18771425321 - 2² = 18771425317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18771425221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22970 + ... + 195116.

It is an arithmetic number, because the mean of its divisors is an integer number (1338622848).

Almost surely, 2^18771425321 is an apocalyptic number.

18771425321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18771425321 is a deficient number, since it is larger than the sum of its proper divisors (2646540247).

18771425321 is a wasteful number, since it uses less digits than its factorization.

18771425321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172612.

The product of its digits is 94080, while the sum is 41.

The spelling of 18771425321 in words is "eighteen billion, seven hundred seventy-one million, four hundred twenty-five thousand, three hundred twenty-one".