142921 has 4 divisors (see below), whose sum is σ = 144144. Its totient is φ = 141700.

The previous prime is 142907. The next prime is 142939. The reversal of 142921 is 129241.

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 a de Polignac number, because none of the positive numbers 2^k-142921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142981) 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, 415 + ... + 676.

It is an arithmetic number, because the mean of its divisors is an integer number (36036).

2¹⁴²⁹²¹ is an apocalyptic number.

It is an amenable number.

142921 is a deficient number, since it is larger than the sum of its proper divisors (1223).

142921 is a wasteful number, since it uses less digits than its factorization.

142921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its digits is 144, while the sum is 19.

The square root of 142921 is about 378.0489386310. The cubic root of 142921 is about 52.2835837908.

The spelling of 142921 in words is "one hundred forty-two thousand, nine hundred twenty-one".