221109901220 has 48 divisors (see below), whose sum is σ = 512244876528. Its totient is φ = 79649341440.

The previous prime is 221109901213. The next prime is 221109901253. The reversal of 221109901220 is 22109901122.

It can be written as a sum of positive squares in 8 ways, for example, as 65462292736 + 155647608484 = 255856^2 + 394522^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10360349 + ... + 10381668.

It is an arithmetic number, because the mean of its divisors is an integer number (10671768261).

Almost surely, 2^221109901220 is an apocalyptic number.

221109901220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221109901220 is an abundant number, since it is smaller than the sum of its proper divisors (291134975308).

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

221109901220 is a wasteful number, since it uses less digits than its factorization.

221109901220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20742080 (or 20742078 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 221109901220 in words is "two hundred twenty-one billion, one hundred nine million, nine hundred one thousand, two hundred twenty".