10212122211221 has 4 divisors (see below), whose sum is σ = 11670996812832. Its totient is φ = 8753247609612.

The previous prime is 10212122211217. The next prime is 10212122211229. The reversal of 10212122211221 is 12211222121201.

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 10212122211221 - 2² = 10212122211217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10212122211193 and 10212122211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212122211229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729437300795 + ... + 729437300808.

It is an arithmetic number, because the mean of its divisors is an integer number (2917749203208).

Almost surely, 2^{10212122211221} is an apocalyptic number.

It is an amenable number.

10212122211221 is a deficient number, since it is larger than the sum of its proper divisors (1458874601611).

10212122211221 is an equidigital number, since it uses as much as digits as its factorization.

10212122211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458874601610.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 10212122211221 its reverse (12211222121201), we get a palindrome (22423344332422).

The spelling of 10212122211221 in words is "ten trillion, two hundred twelve billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".