221321032123218 has 16 divisors (see below), whose sum is σ = 442646216449920. Its totient is φ = 73772985340496.

The previous prime is 221321032123183. The next prime is 221321032123229. The reversal of 221321032123218 is 812321230123122.

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 7 ways as a sum of consecutive naturals, for example, 172315338 + ... + 173594981.

It is an arithmetic number, because the mean of its divisors is an integer number (27665388528120).

Almost surely, 2^{221321032123218} is an apocalyptic number.

221321032123218 is an abundant number, since it is smaller than the sum of its proper divisors (221325184326702).

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

221321032123218 is a wasteful number, since it uses less digits than its factorization.

221321032123218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346016961.

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 221321032123218 in words is "two hundred twenty-one trillion, three hundred twenty-one billion, thirty-two million, one hundred twenty-three thousand, two hundred eighteen".