18821417370 has 64 divisors (see below), whose sum is σ = 51635404800. Its totient is φ = 4301126208.

The previous prime is 18821417287. The next prime is 18821417387. The reversal of 18821417370 is 7371412881.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1821639 + ... + 1831941.

It is an arithmetic number, because the mean of its divisors is an integer number (806803200).

Almost surely, 2^18821417370 is an apocalyptic number.

18821417370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18821417370 is an abundant number, since it is smaller than the sum of its proper divisors (32813987430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18821417370 is a wasteful number, since it uses less digits than its factorization.

18821417370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19019.

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 18821417370 in words is "eighteen billion, eight hundred twenty-one million, four hundred seventeen thousand, three hundred seventy".