212412044021 has 4 divisors (see below), whose sum is σ = 212475246444. Its totient is φ = 212348841600.

The previous prime is 212412044017. The next prime is 212412044087. The reversal of 212412044021 is 120440214212.

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 114302143396 + 98109900625 = 338086^2 + 313225^2 .

It is a cyclic number.

It is not a de Polignac number, because 212412044021 - 2² = 212412044017 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 (212412044921) 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, 31596170 + ... + 31602891.

It is an arithmetic number, because the mean of its divisors is an integer number (53118811611).

Almost surely, 2^212412044021 is an apocalyptic number.

It is an amenable number.

212412044021 is a deficient number, since it is larger than the sum of its proper divisors (63202423).

212412044021 is an equidigital number, since it uses as much as digits as its factorization.

212412044021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63202422.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 212412044021 its reverse (120440214212), we get a palindrome (332852258233).

The spelling of 212412044021 in words is "two hundred twelve billion, four hundred twelve million, forty-four thousand, twenty-one".