220021101018 has 12 divisors (see below), whose sum is σ = 476712385578. Its totient is φ = 73340367000.

The previous prime is 220021101017. The next prime is 220021101061. The reversal of 220021101018 is 810101120022.

It can be written as a sum of positive squares in only one way, i.e., 176372281089 + 43648819929 = 419967^2 + 208923^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12223394501 = 220021101018 / (2 + 2 + 0 + 0 + 2 + 1 + 1 + 0 + 1 + 0 + 1 + 8).

It is not an unprimeable number, because it can be changed into a prime (220021101017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6111697233 + ... + 6111697268.

Almost surely, 2^220021101018 is an apocalyptic number.

220021101018 is an abundant number, since it is smaller than the sum of its proper divisors (256691284560).

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

220021101018 is a wasteful number, since it uses less digits than its factorization.

220021101018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223394509 (or 12223394506 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The spelling of 220021101018 in words is "two hundred twenty billion, twenty-one million, one hundred one thousand, eighteen".