142120000021 has 4 divisors (see below), whose sum is σ = 142125362892. Its totient is φ = 142114637152.

The previous prime is 142119999899. The next prime is 142120000027. The reversal of 142120000021 is 120000021241.

It is a happy number.

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 121183356996 + 20936643025 = 348114^2 + 144695^2 .

It is a cyclic number.

It is not a de Polignac number, because 142120000021 - 2¹³ = 142119991829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142119999956 and 142120000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142120000027) 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, 2641486 + ... + 2694751.

It is an arithmetic number, because the mean of its divisors is an integer number (35531340723).

Almost surely, 2^142120000021 is an apocalyptic number.

It is an amenable number.

142120000021 is a deficient number, since it is larger than the sum of its proper divisors (5362871).

142120000021 is an equidigital number, since it uses as much as digits as its factorization.

142120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5362870.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 142120000021 its reverse (120000021241), we get a palindrome (262120021262).

The spelling of 142120000021 in words is "one hundred forty-two billion, one hundred twenty million, twenty-one", and thus it is an aban number.