142860021 has 4 divisors (see below), whose sum is σ = 190480032. Its totient is φ = 95240012.

The previous prime is 142860017. The next prime is 142860037. The reversal of 142860021 is 120068241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142860021 - 2² = 142860017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 142859973 and 142860000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142860721) 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, 23810001 + ... + 23810006.

It is an arithmetic number, because the mean of its divisors is an integer number (47620008).

Almost surely, 2^142860021 is an apocalyptic number.

It is an amenable number.

142860021 is a deficient number, since it is larger than the sum of its proper divisors (47620011).

142860021 is an equidigital number, since it uses as much as digits as its factorization.

142860021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47620010.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 142860021 is about 11952.4064940915. The cubic root of 142860021 is about 522.7614692193.

The spelling of 142860021 in words is "one hundred forty-two million, eight hundred sixty thousand, twenty-one".