221021221020102 has 24 divisors (see below), whose sum is σ = 484941075659040. Its totient is φ = 72741161347920.

The previous prime is 221021221020101. The next prime is 221021221020121. The reversal of 221021221020102 is 201020122120122.

It is a happy number.

221021221020102 is a `hidden beast` number, since 2 + 210 + 212 + 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 not an unprimeable number, because it can be changed into a prime (221021221020101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77714914549 + ... + 77714917392.

It is an arithmetic number, because the mean of its divisors is an integer number (20205878152460).

Almost surely, 2^{221021221020102} is an apocalyptic number.

221021221020102 is an abundant number, since it is smaller than the sum of its proper divisors (263919854638938).

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

221021221020102 is a wasteful number, since it uses less digits than its factorization.

221021221020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155429832028 (or 155429832025 counting only the distinct ones).

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

Adding to 221021221020102 its reverse (201020122120122), we get a palindrome (422041343140224).

The spelling of 221021221020102 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, twenty thousand, one hundred two".