18218221010 has 48 divisors (see below), whose sum is σ = 36076622400. Its totient is φ = 6618992160.

The previous prime is 18218220991. The next prime is 18218221033. The reversal of 18218221010 is 1012281281.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1517411 + ... + 1529369.

It is an arithmetic number, because the mean of its divisors is an integer number (751596300).

Almost surely, 2^18218221010 is an apocalyptic number.

18218221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18218221010 is a deficient number, since it is larger than the sum of its proper divisors (17858401390).

18218221010 is a wasteful number, since it uses less digits than its factorization.

18218221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13247 (or 13236 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

The spelling of 18218221010 in words is "eighteen billion, two hundred eighteen million, two hundred twenty-one thousand, ten".