10211210121221 has 4 divisors (see below), whose sum is σ = 10268255988000. Its totient is φ = 10154164254444.

The previous prime is 10211210121163. The next prime is 10211210121223. The reversal of 10211210121221 is 12212101211201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10211210121221 - 2¹⁸ = 10211209859077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10211210121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211210121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28522933121 + ... + 28522933478.

It is an arithmetic number, because the mean of its divisors is an integer number (2567063997000).

Almost surely, 2^{10211210121221} is an apocalyptic number.

It is an amenable number.

10211210121221 is a deficient number, since it is larger than the sum of its proper divisors (57045866779).

10211210121221 is an equidigital number, since it uses as much as digits as its factorization.

10211210121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57045866778.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10211210121221 its reverse (12212101211201), we get a palindrome (22423311332422).

The spelling of 10211210121221 in words is "ten trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".