1042122421 has 4 divisors (see below), whose sum is σ = 1049729292. Its totient is φ = 1034515552.

The previous prime is 1042122391. The next prime is 1042122467. The reversal of 1042122421 is 1242212401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 917241796 + 124880625 = 30286^2 + 11175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042122421 - 2²⁷ = 907904693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042122721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3803230 + ... + 3803503.

It is an arithmetic number, because the mean of its divisors is an integer number (262432323).

Almost surely, 2^1042122421 is an apocalyptic number.

It is an amenable number.

1042122421 is a deficient number, since it is larger than the sum of its proper divisors (7606871).

1042122421 is an equidigital number, since it uses as much as digits as its factorization.

1042122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606870.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1042122421 is about 32281.9209620493. The cubic root of 1042122421 is about 1013.8481505019.

Adding to 1042122421 its reverse (1242212401), we get a palindrome (2284334822).

It can be divided in two parts, 10 and 42122421, that added together give a triangular number (42122431 = T₉₁₇₈).

The spelling of 1042122421 in words is "one billion, forty-two million, one hundred twenty-two thousand, four hundred twenty-one".