18700677821221 has 4 divisors (see below), whose sum is σ = 20400739441344. Its totient is φ = 17000616201100.

The previous prime is 18700677821213. The next prime is 18700677821311. The reversal of 18700677821221 is 12212877600781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18700677821221 - 2³ = 18700677821213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700677821921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850030810045 + ... + 850030810066.

It is an arithmetic number, because the mean of its divisors is an integer number (5100184860336).

Almost surely, 2^{18700677821221} is an apocalyptic number.

18700677821221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18700677821221 is a deficient number, since it is larger than the sum of its proper divisors (1700061620123).

18700677821221 is a wasteful number, since it uses less digits than its factorization.

18700677821221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700061620122.

The product of its (nonzero) digits is 1053696, while the sum is 52.

The spelling of 18700677821221 in words is "eighteen trillion, seven hundred billion, six hundred seventy-seven million, eight hundred twenty-one thousand, two hundred twenty-one".