442102121 has 2 divisors, whose sum is σ = 442102122. Its totient is φ = 442102120.

The previous prime is 442102103. The next prime is 442102123. The reversal of 442102121 is 121201244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441462121 + 640000 = 21011^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 442102121 - 2²² = 437907817 is a prime.

Together with 442102123, 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 442102121.

It is not a weakly prime, because it can be changed into another prime (442102123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221051060 + 221051061.

It is an arithmetic number, because the mean of its divisors is an integer number (221051061).

Almost surely, 2^442102121 is an apocalyptic number.

It is an amenable number.

442102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

442102121 is an equidigital number, since it uses as much as digits as its factorization.

442102121 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 442102121 is about 21026.2246016730. The cubic root of 442102121 is about 761.7998207760.

Adding to 442102121 its reverse (121201244), we get a palindrome (563303365).

The spelling of 442102121 in words is "four hundred forty-two million, one hundred two thousand, one hundred twenty-one".