1142405021 has 4 divisors (see below), whose sum is σ = 1148324412. Its totient is φ = 1136485632.

The previous prime is 1142405003. The next prime is 1142405059. The reversal of 1142405021 is 1205042411.

It is a happy number.

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 710222500 + 432182521 = 26650^2 + 20789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142405021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1142404984 and 1142405002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142405921) 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, 2959406 + ... + 2959791.

It is an arithmetic number, because the mean of its divisors is an integer number (287081103).

Almost surely, 2^1142405021 is an apocalyptic number.

It is an amenable number.

1142405021 is a deficient number, since it is larger than the sum of its proper divisors (5919391).

1142405021 is an equidigital number, since it uses as much as digits as its factorization.

1142405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919390.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1142405021 is about 33799.4825552108. The cubic root of 1142405021 is about 1045.3780279567.

Adding to 1142405021 its reverse (1205042411), we get a palindrome (2347447432).

The spelling of 1142405021 in words is "one billion, one hundred forty-two million, four hundred five thousand, twenty-one".