10212121212221 has 4 divisors (see below), whose sum is σ = 10212136303200. Its totient is φ = 10212106121244.

The previous prime is 10212121212187. The next prime is 10212121212281. The reversal of 10212121212221 is 12221212121201.

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 10212121212221 - 2⁴² = 5814074701117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212121212193 and 10212121212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212121212281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6480311 + ... + 7900548.

It is an arithmetic number, because the mean of its divisors is an integer number (2553034075800).

Almost surely, 2^{10212121212221} is an apocalyptic number.

It is an amenable number.

10212121212221 is a deficient number, since it is larger than the sum of its proper divisors (15090979).

10212121212221 is an equidigital number, since it uses as much as digits as its factorization.

10212121212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15090978.

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

Adding to 10212121212221 its reverse (12221212121201), we get a palindrome (22433333333422).

The spelling of 10212121212221 in words is "ten trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".