221211202020102 has 128 divisors (see below), whose sum is σ = 575539872768000. Its totient is φ = 61658331840000.

The previous prime is 221211202020089. The next prime is 221211202020203. The reversal of 221211202020102 is 201020202112122.

It is a happy number.

221211202020102 is a `hidden beast` number, since 221 + 21 + 120 + 202 + 0 + 102 = 666.

221211202020102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221211202020102² (a number of 29 digits) contains 22 as substring.

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 polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 294101899 + ... + 294853097.

It is an arithmetic number, because the mean of its divisors is an integer number (4496405256000).

Almost surely, 2^{221211202020102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211202020102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287769936384000).

221211202020102 is an abundant number, since it is smaller than the sum of its proper divisors (354328670747898).

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

221211202020102 is a wasteful number, since it uses less digits than its factorization.

221211202020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770259 (or 770253 counting only the distinct ones).

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

Adding to 221211202020102 its reverse (201020202112122), we get a palindrome (422231404132224).

The spelling of 221211202020102 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred two million, twenty thousand, one hundred two".