142156021551 has 4 divisors (see below), whose sum is σ = 189541362072. Its totient is φ = 94770681032.

The previous prime is 142156021531. The next prime is 142156021561. The reversal of 142156021551 is 155120651241.

It is a happy number.

142156021551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155120651241 = 3 ⋅51706883747.

It is a cyclic number.

It is not a de Polignac number, because 142156021551 - 2⁹ = 142156021039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142156021531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23692670256 + ... + 23692670261.

It is an arithmetic number, because the mean of its divisors is an integer number (47385340518).

Almost surely, 2^142156021551 is an apocalyptic number.

142156021551 is a deficient number, since it is larger than the sum of its proper divisors (47385340521).

142156021551 is an equidigital number, since it uses as much as digits as its factorization.

142156021551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47385340520.

The product of its (nonzero) digits is 12000, while the sum is 33.

Adding to 142156021551 its reverse (155120651241), we get a palindrome (297276672792).

The spelling of 142156021551 in words is "one hundred forty-two billion, one hundred fifty-six million, twenty-one thousand, five hundred fifty-one".