212221122131 has 4 divisors (see below), whose sum is σ = 212750352264. Its totient is φ = 211691892000.

The previous prime is 212221122077. The next prime is 212221122151. The reversal of 212221122131 is 131221122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212221122131 - 2⁶ = 212221122067 is a prime.

It is a super-2 number, since 2×212221122131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221122151) 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, 264614465 + ... + 264615266.

It is an arithmetic number, because the mean of its divisors is an integer number (53187588066).

Almost surely, 2^212221122131 is an apocalyptic number.

212221122131 is a deficient number, since it is larger than the sum of its proper divisors (529230133).

212221122131 is an equidigital number, since it uses as much as digits as its factorization.

212221122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529230132.

The product of its digits is 192, while the sum is 20.

Adding to 212221122131 its reverse (131221122212), we get a palindrome (343442244343).

The spelling of 212221122131 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred thirty-one".