142421057 has 4 divisors (see below), whose sum is σ = 142461636. Its totient is φ = 142380480.

The previous prime is 142421051. The next prime is 142421113. The reversal of 142421057 is 750124241.

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 59228416 + 83192641 = 7696^2 + 9121^2 .

It is a cyclic number.

It is not a de Polignac number, because 142421057 - 2¹⁴ = 142404673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142421051) 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, 14468 + ... + 22229.

It is an arithmetic number, because the mean of its divisors is an integer number (35615409).

Almost surely, 2^142421057 is an apocalyptic number.

It is an amenable number.

142421057 is a deficient number, since it is larger than the sum of its proper divisors (40579).

142421057 is an equidigital number, since it uses as much as digits as its factorization.

142421057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40578.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 142421057 is about 11934.0293698315. The cubic root of 142421057 is about 522.2254925822.

Adding to 142421057 its reverse (750124241), we get a palindrome (892545298).

The spelling of 142421057 in words is "one hundred forty-two million, four hundred twenty-one thousand, fifty-seven".