142909256721 has 16 divisors (see below), whose sum is σ = 237563440128. Its totient is φ = 74238574800.

The previous prime is 142909256683. The next prime is 142909256729. The reversal of 142909256721 is 127652909241.

It is a happy number.

It is not a de Polignac number, because 142909256721 - 2²⁵ = 142875702289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142909256729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309327165 + ... + 309327626.

It is an arithmetic number, because the mean of its divisors is an integer number (14847715008).

Almost surely, 2^142909256721 is an apocalyptic number.

142909256721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142909256721 is a deficient number, since it is larger than the sum of its proper divisors (94654183407).

142909256721 is a wasteful number, since it uses less digits than its factorization.

142909256721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618654812.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 142909256721 in words is "one hundred forty-two billion, nine hundred nine million, two hundred fifty-six thousand, seven hundred twenty-one".