221809115060 has 24 divisors (see below), whose sum is σ = 501629845416. Its totient is φ = 81898750080.

The previous prime is 221809114999. The next prime is 221809115081. The reversal of 221809115060 is 60511908122.

It can be written as a sum of positive squares in 4 ways, for example, as 45150300196 + 176658814864 = 212486^2 + 420308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221809115060.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426555731 + ... + 426556250.

It is an arithmetic number, because the mean of its divisors is an integer number (20901243559).

Almost surely, 2^221809115060 is an apocalyptic number.

221809115060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221809115060 is an abundant number, since it is smaller than the sum of its proper divisors (279820730356).

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

221809115060 is a wasteful number, since it uses less digits than its factorization.

221809115060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853112003 (or 853112001 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The spelling of 221809115060 in words is "two hundred twenty-one billion, eight hundred nine million, one hundred fifteen thousand, sixty".