1042242221 has 4 divisors (see below), whose sum is σ = 1043139552. Its totient is φ = 1041344892.

The previous prime is 1042242211. The next prime is 1042242241. The reversal of 1042242221 is 1222422401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1042242221 - 2¹⁸ = 1041980077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1042242193 and 1042242202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042242211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446921 + ... + 449246.

It is an arithmetic number, because the mean of its divisors is an integer number (260784888).

Almost surely, 2^1042242221 is an apocalyptic number.

It is an amenable number.

1042242221 is a deficient number, since it is larger than the sum of its proper divisors (897331).

1042242221 is an equidigital number, since it uses as much as digits as its factorization.

1042242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897330.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1042242221 is about 32283.7764364704. The cubic root of 1042242221 is about 1013.8869988982.

Adding to 1042242221 its reverse (1222422401), we get a palindrome (2264664622).

The spelling of 1042242221 in words is "one billion, forty-two million, two hundred forty-two thousand, two hundred twenty-one".