1042120421 has 4 divisors (see below), whose sum is σ = 1042362144. Its totient is φ = 1041878700.

The previous prime is 1042120393. The next prime is 1042120439. The reversal of 1042120421 is 1240212401.

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 1042120421 - 2²² = 1037926117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1042120421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042120441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114275 + ... + 123056.

It is an arithmetic number, because the mean of its divisors is an integer number (260590536).

Almost surely, 2^1042120421 is an apocalyptic number.

It is an amenable number.

1042120421 is a deficient number, since it is larger than the sum of its proper divisors (241723).

1042120421 is an equidigital number, since it uses as much as digits as its factorization.

1042120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241722.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1042120421 is about 32281.8899849436. The cubic root of 1042120421 is about 1013.8475019224.

Adding to 1042120421 its reverse (1240212401), we get a palindrome (2282332822).

The spelling of 1042120421 in words is "one billion, forty-two million, one hundred twenty thousand, four hundred twenty-one".