1142420021 has 2 divisors, whose sum is σ = 1142420022. Its totient is φ = 1142420020.

The previous prime is 1142419981. The next prime is 1142420047. The reversal of 1142420021 is 1200242411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 39250225 = 33214^2 + 6265^2 .

It is an emirp because it is prime and its reverse (1200242411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1142420021 - 2¹⁰ = 1142418997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142420221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571210010 + 571210011.

It is an arithmetic number, because the mean of its divisors is an integer number (571210011).

Almost surely, 2^1142420021 is an apocalyptic number.

It is an amenable number.

1142420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142420021 is an equidigital number, since it uses as much as digits as its factorization.

1142420021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1142420021 is about 33799.7044513706. The cubic root of 1142420021 is about 1045.3826032756.

Adding to 1142420021 its reverse (1200242411), we get a palindrome (2342662432).

The spelling of 1142420021 in words is "one billion, one hundred forty-two million, four hundred twenty thousand, twenty-one".