212043022421 has 4 divisors (see below), whose sum is σ = 212050957452. Its totient is φ = 212035087392.

The previous prime is 212043022363. The next prime is 212043022487. The reversal of 212043022421 is 124220340212.

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 183890880625 + 28152141796 = 428825^2 + 167786^2 .

It is a cyclic number.

It is not a de Polignac number, because 212043022421 - 2³⁴ = 194863153237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212043024421) 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, 3927296 + ... + 3980921.

It is an arithmetic number, because the mean of its divisors is an integer number (53012739363).

Almost surely, 2^212043022421 is an apocalyptic number.

It is an amenable number.

212043022421 is a deficient number, since it is larger than the sum of its proper divisors (7935031).

212043022421 is an equidigital number, since it uses as much as digits as its factorization.

212043022421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7935030.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 212043022421 its reverse (124220340212), we get a palindrome (336263362633).

The spelling of 212043022421 in words is "two hundred twelve billion, forty-three million, twenty-two thousand, four hundred twenty-one".