221293691790 has 32 divisors (see below), whose sum is σ = 559057749120. Its totient is φ = 55905774624.

The previous prime is 221293691777. The next prime is 221293691819. The reversal of 221293691790 is 97196392122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194116704 + ... + 194117843.

It is an arithmetic number, because the mean of its divisors is an integer number (17470554660).

Almost surely, 2^221293691790 is an apocalyptic number.

221293691790 is an abundant number, since it is smaller than the sum of its proper divisors (337764057330).

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

221293691790 is a wasteful number, since it uses less digits than its factorization.

221293691790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388234576.

The product of its (nonzero) digits is 734832, while the sum is 51.

The spelling of 221293691790 in words is "two hundred twenty-one billion, two hundred ninety-three million, six hundred ninety-one thousand, seven hundred ninety".