212221021121 has 4 divisors (see below), whose sum is σ = 219066860544. Its totient is φ = 205375181700.

The previous prime is 212221021099. The next prime is 212221021139. The reversal of 212221021121 is 121120122212.

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 a de Polignac number, because none of the positive numbers 2^k-212221021121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212221021121.

It is not an unprimeable number, because it can be changed into a prime (212221021421) 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, 3422919665 + ... + 3422919726.

It is an arithmetic number, because the mean of its divisors is an integer number (54766715136).

Almost surely, 2^212221021121 is an apocalyptic number.

It is an amenable number.

212221021121 is a deficient number, since it is larger than the sum of its proper divisors (6845839423).

212221021121 is an equidigital number, since it uses as much as digits as its factorization.

212221021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6845839422.

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

Adding to 212221021121 its reverse (121120122212), we get a palindrome (333341143333).

The spelling of 212221021121 in words is "two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, one hundred twenty-one".