142021 has 4 divisors (see below), whose sum is σ = 154944. Its totient is φ = 129100.

The previous prime is 142019. The next prime is 142031. The reversal of 142021 is 120241.

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 142021 - 2¹ = 142019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 141989 and 142007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142031) 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, 6445 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (38736).

2¹⁴²⁰²¹ is an apocalyptic number.

142021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142021 is a deficient number, since it is larger than the sum of its proper divisors (12923).

142021 is a wasteful number, since it uses less digits than its factorization.

142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12922.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 142021 is about 376.8567367051. The cubic root of 142021 is about 52.1736061476.

Adding to 142021 its reverse (120241), we get a palindrome (262262).

It can be divided in two parts, 1420 and 21, that added together give a palindrome (1441).

The spelling of 142021 in words is "one hundred forty-two thousand, twenty-one", and thus it is an iban number.