1221293 has 4 divisors (see below), whose sum is σ = 1225980. Its totient is φ = 1216608.

The previous prime is 1221289. The next prime is 1221299. The reversal of 1221293 is 3921221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3921221 = 31 ⋅126491.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 1075369 = 382^2 + 1037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221293 - 2² = 1221289 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221299) 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, 1928 + ... + 2481.

It is an arithmetic number, because the mean of its divisors is an integer number (306495).

2^1221293 is an apocalyptic number.

It is an amenable number.

1221293 is a deficient number, since it is larger than the sum of its proper divisors (4687).

1221293 is an equidigital number, since it uses as much as digits as its factorization.

1221293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686.

The product of its digits is 216, while the sum is 20.

The square root of 1221293 is about 1105.1212603149. The cubic root of 1221293 is about 106.8907085650.

It can be divided in two parts, 1221 and 293, that multiplied together give a palindrome (357753).

The spelling of 1221293 in words is "one million, two hundred twenty-one thousand, two hundred ninety-three".