202101222201021 has 24 divisors (see below), whose sum is σ = 342959649797856. Its totient is φ = 113063620811040.

The previous prime is 202101222201017. The next prime is 202101222201149. The reversal of 202101222201021 is 120102222101202.

It is a happy number.

It is not a de Polignac number, because 202101222201021 - 2² = 202101222201017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202101222200985 and 202101222201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101222200021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78516402055 + ... + 78516404628.

It is an arithmetic number, because the mean of its divisors is an integer number (14289985408244).

Almost surely, 2^{202101222201021} is an apocalyptic number.

It is an amenable number.

202101222201021 is a deficient number, since it is larger than the sum of its proper divisors (140858427596835).

202101222201021 is a wasteful number, since it uses less digits than its factorization.

202101222201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157032806713 (or 157032806710 counting only the distinct ones).

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

Adding to 202101222201021 its reverse (120102222101202), we get a palindrome (322203444302223).

The spelling of 202101222201021 in words is "two hundred two trillion, one hundred one billion, two hundred twenty-two million, two hundred one thousand, twenty-one".