442121923 has 2 divisors, whose sum is σ = 442121924. Its totient is φ = 442121922.

The previous prime is 442121909. The next prime is 442121929. The reversal of 442121923 is 329121244.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 442121923 - 2¹³ = 442113731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442121891 and 442121900.

It is not a weakly prime, because it can be changed into another prime (442121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221060961 + 221060962.

It is an arithmetic number, because the mean of its divisors is an integer number (221060962).

Almost surely, 2^442121923 is an apocalyptic number.

442121923 is a deficient number, since it is larger than the sum of its proper divisors (1).

442121923 is an equidigital number, since it uses as much as digits as its factorization.

442121923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 442121923 is about 21026.6954845501. The cubic root of 442121923 is about 761.8111944189.

The spelling of 442121923 in words is "four hundred forty-two million, one hundred twenty-one thousand, nine hundred twenty-three".