18521431938002 has 24 divisors (see below), whose sum is σ = 32319951379020. Its totient is φ = 7937279417760.

The previous prime is 18521431937993. The next prime is 18521431938011. The reversal of 18521431938002 is 20083913412581.

It is an interprime number because it is at equal distance from previous prime (18521431937993) and next prime (18521431938011).

It can be written as a sum of positive squares in 2 ways, for example, as 16841740769161 + 1679691168841 = 4103869^2 + 1296029^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4038977 + ... + 7304532.

Almost surely, 2^{18521431938002} is an apocalyptic number.

18521431938002 is a deficient number, since it is larger than the sum of its proper divisors (13798519441018).

18521431938002 is a wasteful number, since it uses less digits than its factorization.

18521431938002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360186 (or 11360179 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 18521431938002 in words is "eighteen trillion, five hundred twenty-one billion, four hundred thirty-one million, nine hundred thirty-eight thousand, two".