202120221212221 has 48 divisors (see below), whose sum is σ = 225592941974400. Its totient is φ = 180894894935040.

The previous prime is 202120221212123. The next prime is 202120221212233. The reversal of 202120221212221 is 122212122021202.

It is not a de Polignac number, because 202120221212221 - 2²¹ = 202120219115069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202120221212192 and 202120221212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120221212291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1181606926 + ... + 1181777968.

It is an arithmetic number, because the mean of its divisors is an integer number (4699852957800).

Almost surely, 2^{202120221212221} is an apocalyptic number.

It is an amenable number.

202120221212221 is a deficient number, since it is larger than the sum of its proper divisors (23472720762179).

202120221212221 is a wasteful number, since it uses less digits than its factorization.

202120221212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172166 (or 172153 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 202120221212221 its reverse (122212122021202), we get a palindrome (324332343233423).

The spelling of 202120221212221 in words is "two hundred two trillion, one hundred twenty billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".