221220221100102 has 60 divisors (see below), whose sum is σ = 576627311028780. Its totient is φ = 63205777454904.

The previous prime is 221220221100091. The next prime is 221220221100143. The reversal of 221220221100102 is 201001122022122.

It is a happy number.

221220221100102 is a `hidden beast` number, since 2 + 21 + 220 + 221 + 100 + 102 = 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 (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13934246352 + ... + 13934262227.

It is an arithmetic number, because the mean of its divisors is an integer number (9610455183813).

Almost surely, 2^{221220221100102} is an apocalyptic number.

221220221100102 is an abundant number, since it is smaller than the sum of its proper divisors (355407089928678).

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

221220221100102 is a wasteful number, since it uses less digits than its factorization.

221220221100102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27868508607 (or 27868508591 counting only the distinct ones).

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

Adding to 221220221100102 its reverse (201001122022122), we get a palindrome (422221343122224).

The spelling of 221220221100102 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred thousand, one hundred two".