20112221018 has 16 divisors (see below), whose sum is σ = 30695232960. Its totient is φ = 9880649856.

The previous prime is 20112221011. The next prime is 20112221099. The reversal of 20112221018 is 81012221102.

It is not an unprimeable number, because it can be changed into a prime (20112221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195755 + ... + 280257.

It is an arithmetic number, because the mean of its divisors is an integer number (1918452060).

Almost surely, 2^20112221018 is an apocalyptic number.

20112221018 is a deficient number, since it is larger than the sum of its proper divisors (10583011942).

20112221018 is a wasteful number, since it uses less digits than its factorization.

20112221018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86581.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 20112221018 in words is "twenty billion, one hundred twelve million, two hundred twenty-one thousand, eighteen".