1042121221 has 4 divisors (see below), whose sum is σ = 1043296992. Its totient is φ = 1040945452.

The previous prime is 1042121219. The next prime is 1042121239. The reversal of 1042121221 is 1221212401.

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 1042121221 - 2¹ = 1042121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1042121195 and 1042121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042128221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586555 + ... + 588328.

It is an arithmetic number, because the mean of its divisors is an integer number (260824248).

Almost surely, 2^1042121221 is an apocalyptic number.

It is an amenable number.

1042121221 is a deficient number, since it is larger than the sum of its proper divisors (1175771).

1042121221 is an equidigital number, since it uses as much as digits as its factorization.

1042121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175770.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1042121221 is about 32281.9023757894. The cubic root of 1042121221 is about 1013.8477613543.

Adding to 1042121221 its reverse (1221212401), we get a palindrome (2263333622).

The spelling of 1042121221 in words is "one billion, forty-two million, one hundred twenty-one thousand, two hundred twenty-one".