221220121020102 has 24 divisors (see below), whose sum is σ = 479406956021136. Its totient is φ = 73725164369136.

The previous prime is 221220121020089. The next prime is 221220121020131. The reversal of 221220121020102 is 201020121022122.

It is a happy number.

221220121020102 is a `hidden beast` number, since 221 + 2 + 201 + 210 + 20 + 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1239572538 + ... + 1239750989.

It is an arithmetic number, because the mean of its divisors is an integer number (19975289834214).

Almost surely, 2^{221220121020102} is an apocalyptic number.

221220121020102 is an abundant number, since it is smaller than the sum of its proper divisors (258186835001034).

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

221220121020102 is a wasteful number, since it uses less digits than its factorization.

221220121020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479328492 (or 2479328489 counting only the distinct ones).

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

Adding to 221220121020102 its reverse (201020121022122), we get a palindrome (422240242042224).

The spelling of 221220121020102 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty thousand, one hundred two".