162121 has 4 divisors (see below), whose sum is σ = 163072. Its totient is φ = 161172.

The previous prime is 162119. The next prime is 162143. The reversal of 162121 is 121261.

162121 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 162121 - 2¹ = 162119 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162221) 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, 141 + ... + 586.

It is an arithmetic number, because the mean of its divisors is an integer number (40768).

2¹⁶²¹²¹ is an apocalyptic number.

It is an amenable number.

162121 is a deficient number, since it is larger than the sum of its proper divisors (951).

162121 is an equidigital number, since it uses as much as digits as its factorization.

162121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950.

The product of its digits is 24, while the sum is 13.

The square root of 162121 is about 402.6425213511. The cubic root of 162121 is about 54.5271867277.

Adding to 162121 its reverse (121261), we get a palindrome (283382).

The spelling of 162121 in words is "one hundred sixty-two thousand, one hundred twenty-one".