212221320133 has 4 divisors (see below), whose sum is σ = 212282712460. Its totient is φ = 212159927808.

The previous prime is 212221320127. The next prime is 212221320149. The reversal of 212221320133 is 331023122212.

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 23011979809 + 189209340324 = 151697^2 + 434982^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221320133 - 2²⁵ = 212187765701 is a prime.

It is a super-2 number, since 2×212221320133² (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 (212221320533) 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, 30690978 + ... + 30697891.

It is an arithmetic number, because the mean of its divisors is an integer number (53070678115).

Almost surely, 2^212221320133 is an apocalyptic number.

It is an amenable number.

212221320133 is a deficient number, since it is larger than the sum of its proper divisors (61392327).

212221320133 is an equidigital number, since it uses as much as digits as its factorization.

212221320133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61392326.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 212221320133 its reverse (331023122212), we get a palindrome (543244442345).

The spelling of 212221320133 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, one hundred thirty-three".