212013322421 has 4 divisors (see below), whose sum is σ = 212089671372. Its totient is φ = 211936973472.

The previous prime is 212013322399. The next prime is 212013322427. The reversal of 212013322421 is 124223310212.

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 127387603396 + 84625719025 = 356914^2 + 290905^2 .

It is a cyclic number.

It is not a de Polignac number, because 212013322421 - 2¹⁸ = 212013060277 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 (212013322427) 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, 38170310 + ... + 38175863.

It is an arithmetic number, because the mean of its divisors is an integer number (53022417843).

Almost surely, 2^212013322421 is an apocalyptic number.

It is an amenable number.

212013322421 is a deficient number, since it is larger than the sum of its proper divisors (76348951).

212013322421 is an equidigital number, since it uses as much as digits as its factorization.

212013322421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76348950.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 212013322421 its reverse (124223310212), we get a palindrome (336236632633).

The spelling of 212013322421 in words is "two hundred twelve billion, thirteen million, three hundred twenty-two thousand, four hundred twenty-one".