202121211101121 has 80 divisors (see below), whose sum is σ = 339339559870080. Its totient is φ = 118959520458240.

The previous prime is 202121211101113. The next prime is 202121211101219. The reversal of 202121211101121 is 121101112121202.

It is a happy number.

202121211101121 is a `hidden beast` number, since 20 + 212 + 1 + 211 + 101 + 121 = 666.

It is not a de Polignac number, because 202121211101121 - 2³ = 202121211101113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202121211101094 and 202121211101103.

It is not an unprimeable number, because it can be changed into a prime (202121211101111) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 195197370 + ... + 196230108.

It is an arithmetic number, because the mean of its divisors is an integer number (4241744498376).

Almost surely, 2^{202121211101121} is an apocalyptic number.

It is an amenable number.

202121211101121 is a deficient number, since it is larger than the sum of its proper divisors (137218348768959).

202121211101121 is a wasteful number, since it uses less digits than its factorization.

202121211101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040868 (or 1040859 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 202121211101121 its reverse (121101112121202), we get a palindrome (323222323222323).

The spelling of 202121211101121 in words is "two hundred two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred one thousand, one hundred twenty-one".