201221322102 has 24 divisors (see below), whose sum is σ = 437803722720. Its totient is φ = 66793129200.

The previous prime is 201221322089. The next prime is 201221322109. The reversal of 201221322102 is 201223122102.

201221322102 is a `hidden beast` number, since 20 + 1 + 221 + 322 + 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 not an unprimeable number, because it can be changed into a prime (201221322109) 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, 23382649 + ... + 23391252.

It is an arithmetic number, because the mean of its divisors is an integer number (18241821780).

Almost surely, 2^201221322102 is an apocalyptic number.

201221322102 is an abundant number, since it is smaller than the sum of its proper divisors (236582400618).

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

201221322102 is a wasteful number, since it uses less digits than its factorization.

201221322102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46774148 (or 46774145 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 201221322102 its reverse (201223122102), we get a palindrome (402444444204).

The spelling of 201221322102 in words is "two hundred one billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred two".