1221371 has 4 divisors (see below), whose sum is σ = 1227072.
Its totient is φ = 1215672.
The previous prime is 1221299. The next prime is 1221373. The reversal of 1221371 is 1731221.
Adding to 1221371 its reverse (1731221), we get a palindrome (2952592).
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 1221371 - 210 = 1220347 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1221373) 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, 2516 + ... + 2961.
It is an arithmetic number, because the mean of its divisors is an integer number (306768).
21221371 is an apocalyptic number.
1221371 is a deficient number, since it is larger than the sum of its proper divisors (5701).
1221371 is an equidigital number, since it uses as much as digits as its factorization.
1221371 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5700.
The product of its digits is 84, while the sum is 17.
The square root of 1221371 is about 1105.1565499964.
The cubic root of 1221371 is about 106.8929841035.
The spelling of 1221371 in words is "one million, two hundred twenty-one thousand, three hundred seventy-one".