142021021 has 4 divisors (see below), whose sum is σ = 148195872. Its totient is φ = 135846172.

The previous prime is 142021001. The next prime is 142021031. The reversal of 142021021 is 120120241.

It is a happy number.

142021021 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 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 142021021 - 2⁹ = 142020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142020992 and 142021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142021001) 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, 3087391 + ... + 3087436.

It is an arithmetic number, because the mean of its divisors is an integer number (37048968).

Almost surely, 2^142021021 is an apocalyptic number.

It is an amenable number.

142021021 is a deficient number, since it is larger than the sum of its proper divisors (6174851).

142021021 is an equidigital number, since it uses as much as digits as its factorization.

142021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174850.

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

The square root of 142021021 is about 11917.2572767395. The cubic root of 142021021 is about 521.7360871911.

Adding to 142021021 its reverse (120120241), we get a palindrome (262141262).

The spelling of 142021021 in words is "one hundred forty-two million, twenty-one thousand, twenty-one".