142121 has 8 divisors (see below), whose sum is σ = 165120. Its totient is φ = 119808.

The previous prime is 142111. The next prime is 142123. The reversal of 142121 is 121241.

142121 = T₁₉₈ + T₁₉₉ + ... + T₂₀₄.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142121 - 2⁶ = 142057 is a prime.

It is a Duffinian number.

142121 is a modest number, since divided by 2121 gives 14 as remainder.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 142121.

It is not an unprimeable number, because it can be changed into a prime (142123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (20640).

2¹⁴²¹²¹ is an apocalyptic number.

It is an amenable number.

142121 is a deficient number, since it is larger than the sum of its proper divisors (22999).

142121 is an equidigital number, since it uses as much as digits as its factorization.

142121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its digits is 16, while the sum is 11.

The square root of 142121 is about 376.9893897711. The cubic root of 142121 is about 52.1858487890.

Adding to 142121 its reverse (121241), we get a palindrome (263362).

The spelling of 142121 in words is "one hundred forty-two thousand, one hundred twenty-one", and thus it is an iban number.