18521347421144 has 16 divisors (see below), whose sum is σ = 34727909446800. Its totient is φ = 9260571568672.

The previous prime is 18521347421117. The next prime is 18521347421179. The reversal of 18521347421144 is 44112474312581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11994332 + ... + 13450155.

It is an arithmetic number, because the mean of its divisors is an integer number (2170494340425).

Almost surely, 2^{18521347421144} is an apocalyptic number.

It is an amenable number.

18521347421144 is a deficient number, since it is larger than the sum of its proper divisors (16206562025656).

18521347421144 is a wasteful number, since it uses less digits than its factorization.

18521347421144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25535482 (or 25535478 counting only the distinct ones).

The product of its digits is 860160, while the sum is 47.

The spelling of 18521347421144 in words is "eighteen trillion, five hundred twenty-one billion, three hundred forty-seven million, four hundred twenty-one thousand, one hundred forty-four".