142057721 has 8 divisors (see below), whose sum is σ = 154922880. Its totient is φ = 129469392.

The previous prime is 142057711. The next prime is 142057733. The reversal of 142057721 is 127750241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 142057721 - 2¹⁰ = 142056697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142057711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68135 + ... + 70188.

It is an arithmetic number, because the mean of its divisors is an integer number (19365360).

Almost surely, 2^142057721 is an apocalyptic number.

It is an amenable number.

142057721 is a deficient number, since it is larger than the sum of its proper divisors (12865159).

142057721 is a wasteful number, since it uses less digits than its factorization.

142057721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138415.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 142057721 is about 11918.7969611031. The cubic root of 142057721 is about 521.7810243541.

The spelling of 142057721 in words is "one hundred forty-two million, fifty-seven thousand, seven hundred twenty-one".