18712228421384 has 8 divisors (see below), whose sum is σ = 35085428290110. Its totient is φ = 9356114210688.

The previous prime is 18712228421329. The next prime is 18712228421399. The reversal of 18712228421384 is 48312482221781.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15212418096100 + 3499810325284 = 3900310^2 + 1870778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18712228421384² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1169514276329 + ... + 1169514276344.

Almost surely, 2^{18712228421384} is an apocalyptic number.

It is an amenable number.

18712228421384 is a deficient number, since it is larger than the sum of its proper divisors (16373199868726).

18712228421384 is a wasteful number, since it uses less digits than its factorization.

18712228421384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339028552679 (or 2339028552675 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 53.

The spelling of 18712228421384 in words is "eighteen trillion, seven hundred twelve billion, two hundred twenty-eight million, four hundred twenty-one thousand, three hundred eighty-four".