212111134421 has 4 divisors (see below), whose sum is σ = 219425311500. Its totient is φ = 204796957344.

The previous prime is 212111134399. The next prime is 212111134427. The reversal of 212111134421 is 124431111212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 100036833796 + 112074300625 = 316286^2 + 334775^2 .

It is a cyclic number.

It is not a de Polignac number, because 212111134421 - 2²² = 212106940117 is a prime.

It is a super-2 number, since 2×212111134421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111134427) 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, 3657088496 + ... + 3657088553.

It is an arithmetic number, because the mean of its divisors is an integer number (54856327875).

Almost surely, 2^212111134421 is an apocalyptic number.

It is an amenable number.

212111134421 is a deficient number, since it is larger than the sum of its proper divisors (7314177079).

212111134421 is an equidigital number, since it uses as much as digits as its factorization.

212111134421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314177078.

The product of its digits is 384, while the sum is 23.

Adding to 212111134421 its reverse (124431111212), we get a palindrome (336542245633).

The spelling of 212111134421 in words is "two hundred twelve billion, one hundred eleven million, one hundred thirty-four thousand, four hundred twenty-one".