1142420921 has 2 divisors, whose sum is σ = 1142420922. Its totient is φ = 1142420920.

The previous prime is 1142420911. The next prime is 1142420977. The reversal of 1142420921 is 1290242411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658640896 + 483780025 = 25664^2 + 21995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142420921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1142420911) 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 as a sum of consecutive naturals, namely, 571210460 + 571210461.

It is an arithmetic number, because the mean of its divisors is an integer number (571210461).

Almost surely, 2^1142420921 is an apocalyptic number.

It is an amenable number.

1142420921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142420921 is an equidigital number, since it uses as much as digits as its factorization.

1142420921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1142420921 is about 33799.7177650938. The cubic root of 1142420921 is about 1045.3828777935.

The spelling of 1142420921 in words is "one billion, one hundred forty-two million, four hundred twenty thousand, nine hundred twenty-one".