1542421421 has 2 divisors, whose sum is σ = 1542421422. Its totient is φ = 1542421420.

The previous prime is 1542421403. The next prime is 1542421451. The reversal of 1542421421 is 1241242451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1521390025 + 21031396 = 39005^2 + 4586^2 .

It is an emirp because it is prime and its reverse (1241242451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1542421421 - 2⁶ = 1542421357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1542421451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771210710 + 771210711.

It is an arithmetic number, because the mean of its divisors is an integer number (771210711).

Almost surely, 2^1542421421 is an apocalyptic number.

It is an amenable number.

1542421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542421421 is an equidigital number, since it uses as much as digits as its factorization.

1542421421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 26.

The square root of 1542421421 is about 39273.6733830692. The cubic root of 1542421421 is about 1155.4052839563.

Adding to 1542421421 its reverse (1241242451), we get a palindrome (2783663872).

The spelling of 1542421421 in words is "one billion, five hundred forty-two million, four hundred twenty-one thousand, four hundred twenty-one".