442021211 has 2 divisors, whose sum is σ = 442021212. Its totient is φ = 442021210.

The previous prime is 442021201. The next prime is 442021213. The reversal of 442021211 is 112120244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442021211 - 2¹⁸ = 441759067 is a prime.

Together with 442021213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442021211.

It is not a weakly prime, because it can be changed into another prime (442021213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221010605 + 221010606.

It is an arithmetic number, because the mean of its divisors is an integer number (221010606).

Almost surely, 2^442021211 is an apocalyptic number.

442021211 is a deficient number, since it is larger than the sum of its proper divisors (1).

442021211 is an equidigital number, since it uses as much as digits as its factorization.

442021211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 442021211 is about 21024.3004877689. The cubic root of 442021211 is about 761.7533451007.

Adding to 442021211 its reverse (112120244), we get a palindrome (554141455).

The spelling of 442021211 in words is "four hundred forty-two million, twenty-one thousand, two hundred eleven".