221122121022210 has 64 divisors (see below), whose sum is σ = 558713509125120. Its totient is φ = 55853510235840.

The previous prime is 221122121022151. The next prime is 221122121022221. The reversal of 221122121022210 is 12220121221122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27400356 + ... + 34540175.

It is an arithmetic number, because the mean of its divisors is an integer number (8729898580080).

Almost surely, 2^{221122121022210} is an apocalyptic number.

221122121022210 is an abundant number, since it is smaller than the sum of its proper divisors (337591388102910).

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

221122121022210 is a wasteful number, since it uses less digits than its factorization.

221122121022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61946823.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221122121022210 its reverse (12220121221122), we get a palindrome (233342242243332).

The spelling of 221122121022210 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-two thousand, two hundred ten".