1042125021 has 40 divisors (see below), whose sum is σ = 1782444224. Its totient is φ = 594397440.

The previous prime is 1042125013. The next prime is 1042125079. The reversal of 1042125021 is 1205212401.

It is not a de Polignac number, because 1042125021 - 2³ = 1042125013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1042124985 and 1042125003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042125421) 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 39 ways as a sum of consecutive naturals, for example, 380226 + ... + 382956.

Almost surely, 2^1042125021 is an apocalyptic number.

It is an amenable number.

1042125021 is a deficient number, since it is larger than the sum of its proper divisors (740319203).

1042125021 is an equidigital number, since it uses as much as digits as its factorization.

1042125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423 (or 3414 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1042125021 is about 32281.9612322424. The cubic root of 1042125021 is about 1013.8489936539.

Adding to 1042125021 its reverse (1205212401), we get a palindrome (2247337422).

The spelling of 1042125021 in words is "one billion, forty-two million, one hundred twenty-five thousand, twenty-one".