221020121202102 has 24 divisors (see below), whose sum is σ = 491819548982736. Its totient is φ = 71682201470736.

The previous prime is 221020121202061. The next prime is 221020121202103. The reversal of 221020121202102 is 201202121020122.

It is a happy number.

221020121202102 is a `hidden beast` number, since 2 + 210 + 201 + 21 + 20 + 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 not an unprimeable number, because it can be changed into a prime (221020121202103) 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, 165931021258 + ... + 165931022589.

It is an arithmetic number, because the mean of its divisors is an integer number (20492481207614).

Almost surely, 2^{221020121202102} is an apocalyptic number.

221020121202102 is an abundant number, since it is smaller than the sum of its proper divisors (270799427780634).

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

221020121202102 is a wasteful number, since it uses less digits than its factorization.

221020121202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331862043892 (or 331862043889 counting only the distinct ones).

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

Adding to 221020121202102 its reverse (201202121020122), we get a palindrome (422222242222224).

The spelling of 221020121202102 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred two thousand, one hundred two".