1221051141 has 6 divisors (see below), whose sum is σ = 1763740550. Its totient is φ = 814034088.

The previous prime is 1221051121. The next prime is 1221051149. The reversal of 1221051141 is 1411501221.

It can be written as a sum of positive squares in only one way, i.e., 678394116 + 542657025 = 26046^2 + 23295^2 .

It is not a de Polignac number, because 1221051141 - 2⁶ = 1221051077 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 (1221051149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67836166 + ... + 67836183.

Almost surely, 2^1221051141 is an apocalyptic number.

It is an amenable number.

1221051141 is a deficient number, since it is larger than the sum of its proper divisors (542689409).

1221051141 is a wasteful number, since it uses less digits than its factorization.

1221051141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135672355 (or 135672352 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1221051141 is about 34943.5421930863. The cubic root of 1221051141 is about 1068.8365205835.

Adding to 1221051141 its reverse (1411501221), we get a palindrome (2632552362).

The spelling of 1221051141 in words is "one billion, two hundred twenty-one million, fifty-one thousand, one hundred forty-one".