12387905321 has 16 divisors (see below), whose sum is σ = 14802445440. Its totient is φ = 10233780480.

The previous prime is 12387905267. The next prime is 12387905329. The reversal of 12387905321 is 12350978321.

It is not a de Polignac number, because 12387905321 - 2¹⁴ = 12387888937 is a prime.

It is a super-2 number, since 2×12387905321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12387905329) 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, 1136741 + ... + 1147586.

It is an arithmetic number, because the mean of its divisors is an integer number (925152840).

Almost surely, 2^12387905321 is an apocalyptic number.

12387905321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12387905321 is a deficient number, since it is larger than the sum of its proper divisors (2414540119).

12387905321 is a wasteful number, since it uses less digits than its factorization.

12387905321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284384.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 12387905321 in words is "twelve billion, three hundred eighty-seven million, nine hundred five thousand, three hundred twenty-one".