202121112200021 has 8 divisors (see below), whose sum is σ = 231605043760320. Its totient is φ = 172789552379808.

The previous prime is 202121112200009. The next prime is 202121112200083. The reversal of 202121112200021 is 120002211121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-202121112200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121112202021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38092932176 + ... + 38092937481.

It is an arithmetic number, because the mean of its divisors is an integer number (28950630470040).

Almost surely, 2^{202121112200021} is an apocalyptic number.

It is an amenable number.

202121112200021 is a deficient number, since it is larger than the sum of its proper divisors (29483931560299).

202121112200021 is an equidigital number, since it uses as much as digits as its factorization.

202121112200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76185870043.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202121112200021 its reverse (120002211121202), we get a palindrome (322123323321223).

The spelling of 202121112200021 in words is "two hundred two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred thousand, twenty-one".