121213 has 4 divisors (see below), whose sum is σ = 123840. Its totient is φ = 118588.

The previous prime is 121189. The next prime is 121229. The reversal of 121213 is 312121.

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 121213 - 2⁵ = 121181 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121283) 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, 1243 + ... + 1336.

It is an arithmetic number, because the mean of its divisors is an integer number (30960).

2¹²¹²¹³ is an apocalyptic number.

It is an amenable number.

121213 is a deficient number, since it is larger than the sum of its proper divisors (2627).

121213 is an equidigital number, since it uses as much as digits as its factorization.

121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626.

The product of its digits is 12, while the sum is 10.

The square root of 121213 is about 348.1565739721. The cubic root of 121213 is about 49.4898799160.

Adding to 121213 its reverse (312121), we get a palindrome (433334).

It can be divided in two parts, 12121 and 3, that multiplied together give a palindrome (36363).

The spelling of 121213 in words is "one hundred twenty-one thousand, two hundred thirteen".