1221041141 has 4 divisors (see below), whose sum is σ = 1233629292. Its totient is φ = 1208452992.

The previous prime is 1221041117. The next prime is 1221041147. The reversal of 1221041141 is 1411401221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 731702500 + 489338641 = 27050^2 + 22121^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221041141 - 2⁶ = 1221041077 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 (1221041147) 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, 6293930 + ... + 6294123.

It is an arithmetic number, because the mean of its divisors is an integer number (308407323).

Almost surely, 2^1221041141 is an apocalyptic number.

It is an amenable number.

1221041141 is a deficient number, since it is larger than the sum of its proper divisors (12588151).

1221041141 is an equidigital number, since it uses as much as digits as its factorization.

1221041141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12588150.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1221041141 is about 34943.3991048381. The cubic root of 1221041141 is about 1068.8336027711.

Adding to 1221041141 its reverse (1411401221), we get a palindrome (2632442362).

The spelling of 1221041141 in words is "one billion, two hundred twenty-one million, forty-one thousand, one hundred forty-one".