221021200212102 has 40 divisors (see below), whose sum is σ = 497178255477816. Its totient is φ = 73387065166848.

The previous prime is 221021200212091. The next prime is 221021200212149. The reversal of 221021200212102 is 201212002120122.

It is a happy number.

221021200212102 is a `hidden beast` number, since 2 + 210 + 21 + 200 + 21 + 210 + 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2654293768 + ... + 2654377035.

Almost surely, 2^{221021200212102} is an apocalyptic number.

221021200212102 is an abundant number, since it is smaller than the sum of its proper divisors (276157055265714).

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

221021200212102 is a wasteful number, since it uses less digits than its factorization.

221021200212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308671074 (or 5308671065 counting only the distinct ones).

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

Adding to 221021200212102 its reverse (201212002120122), we get a palindrome (422233202332224).

The spelling of 221021200212102 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred million, two hundred twelve thousand, one hundred two".