221001022122210 has 192 divisors, whose sum is σ = 657193125528576. Its totient is φ = 51003737769600.

The previous prime is 221001022122193. The next prime is 221001022122253. The reversal of 221001022122210 is 12221220100122.

It is a happy number.

221001022122210 is a `hidden beast` number, since 2 + 210 + 0 + 1 + 0 + 221 + 22 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18195052 + ... + 27803991.

It is an arithmetic number, because the mean of its divisors is an integer number (3422880862128).

Almost surely, 2^{221001022122210} is an apocalyptic number.

221001022122210 is an abundant number, since it is smaller than the sum of its proper divisors (436192103406366).

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

221001022122210 is a wasteful number, since it uses less digits than its factorization.

221001022122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45999301 (or 45999298 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221001022122210 its reverse (12221220100122), we get a palindrome (233222242222332).

The spelling of 221001022122210 in words is "two hundred twenty-one trillion, one billion, twenty-two million, one hundred twenty-two thousand, two hundred ten".