221815991030 has 24 divisors (see below), whose sum is σ = 400793938272. Its totient is φ = 88388758064.

The previous prime is 221815991009. The next prime is 221815991039. The reversal of 221815991030 is 30199518122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221815991039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 531347 + ... + 852033.

It is an arithmetic number, because the mean of its divisors is an integer number (16699747428).

Almost surely, 2^221815991030 is an apocalyptic number.

221815991030 is a deficient number, since it is larger than the sum of its proper divisors (178977947242).

221815991030 is an equidigital number, since it uses as much as digits as its factorization.

221815991030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321220 (or 320957 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 221815991030 in words is "two hundred twenty-one billion, eight hundred fifteen million, nine hundred ninety-one thousand, thirty".