221001212220102 has 64 divisors (see below), whose sum is σ = 491713588316160. Its totient is φ = 73577113925472.

The previous prime is 221001212220101. The next prime is 221001212220119. The reversal of 221001212220102 is 201022212100122.

It is a happy number.

221001212220102 is a `hidden beast` number, since 221 + 0 + 0 + 1 + 212 + 220 + 10 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001212220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 791488588 + ... + 791767760.

It is an arithmetic number, because the mean of its divisors is an integer number (7683024817440).

Almost surely, 2^{221001212220102} is an apocalyptic number.

221001212220102 is an abundant number, since it is smaller than the sum of its proper divisors (270712376096058).

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

221001212220102 is a wasteful number, since it uses less digits than its factorization.

221001212220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297034 (or 297028 counting only the distinct ones).

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

Adding to 221001212220102 its reverse (201022212100122), we get a palindrome (422023424320224).

The spelling of 221001212220102 in words is "two hundred twenty-one trillion, one billion, two hundred twelve million, two hundred twenty thousand, one hundred two".