202201212121221 has 16 divisors (see below), whose sum is σ = 269667999057600. Its totient is φ = 134767620519168.

The previous prime is 202201212121217. The next prime is 202201212121267. The reversal of 202201212121221 is 122121212102202.

It is not a de Polignac number, because 202201212121221 - 2² = 202201212121217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202201212121021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211414075 + ... + 212368343.

It is an arithmetic number, because the mean of its divisors is an integer number (16854249941100).

Almost surely, 2^{202201212121221} is an apocalyptic number.

It is an amenable number.

202201212121221 is a deficient number, since it is larger than the sum of its proper divisors (67466786936379).

202201212121221 is a wasteful number, since it uses less digits than its factorization.

202201212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971588.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 202201212121221 its reverse (122121212102202), we get a palindrome (324322424223423).

The spelling of 202201212121221 in words is "two hundred two trillion, two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".