202120212220221 has 32 divisors (see below), whose sum is σ = 272651325172480. Its totient is φ = 133177258266624.

The previous prime is 202120212220117. The next prime is 202120212220309. The reversal of 202120212220221 is 122022212021202.

It is not a de Polignac number, because 202120212220221 - 2⁷ = 202120212220093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120212220721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 707900736 + ... + 708186198.

It is an arithmetic number, because the mean of its divisors is an integer number (8520353911640).

Almost surely, 2^{202120212220221} is an apocalyptic number.

It is an amenable number.

202120212220221 is a deficient number, since it is larger than the sum of its proper divisors (70531112952259).

202120212220221 is a wasteful number, since it uses less digits than its factorization.

202120212220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293605.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 202120212220221 its reverse (122022212021202), we get a palindrome (324142424241423).

The spelling of 202120212220221 in words is "two hundred two trillion, one hundred twenty billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".