221997955728558 has 32 divisors (see below), whose sum is σ = 467364856896000. Its totient is φ = 70104506662656.

The previous prime is 221997955728557. The next prime is 221997955728559. The reversal of 221997955728558 is 855827559799122.

It is an interprime number because it is at equal distance from previous prime (221997955728557) and next prime (221997955728559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221997955728557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100089310 + ... + 102283262.

It is an arithmetic number, because the mean of its divisors is an integer number (14605151778000).

Almost surely, 2^{221997955728558} is an apocalyptic number.

221997955728558 is an abundant number, since it is smaller than the sum of its proper divisors (245366901167442).

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

221997955728558 is a wasteful number, since it uses less digits than its factorization.

221997955728558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081576.

The product of its digits is 11430720000, while the sum is 84.

The spelling of 221997955728558 in words is "two hundred twenty-one trillion, nine hundred ninety-seven billion, nine hundred fifty-five million, seven hundred twenty-eight thousand, five hundred fifty-eight".