1221141 has 4 divisors (see below), whose sum is σ = 1628192. Its totient is φ = 814092.

The previous prime is 1221131. The next prime is 1221163. The reversal of 1221141 is 1411221.

It is a happy number.

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 not a de Polignac number, because 1221141 - 2¹⁹ = 696853 is a prime.

It is a D-number.

It is a Duffinian number.

1221141 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131) 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, 203521 + ... + 203526.

It is an arithmetic number, because the mean of its divisors is an integer number (407048).

2^1221141 is an apocalyptic number.

It is an amenable number.

1221141 is a deficient number, since it is larger than the sum of its proper divisors (407051).

1221141 is an equidigital number, since it uses as much as digits as its factorization.

1221141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407050.

The product of its digits is 16, while the sum is 12.

The square root of 1221141 is about 1105.0524874412. The cubic root of 1221141 is about 106.8862739039.

Adding to 1221141 its reverse (1411221), we get a palindrome (2632362).

The spelling of 1221141 in words is "one million, two hundred twenty-one thousand, one hundred forty-one".