1211222141 has 4 divisors (see below), whose sum is σ = 1211980284. Its totient is φ = 1210464000.

The previous prime is 1211222099. The next prime is 1211222153. The reversal of 1211222141 is 1412221121.

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 1155660025 + 55562116 = 33995^2 + 7454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211222141 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 (1211222191) 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, 376670 + ... + 379871.

It is an arithmetic number, because the mean of its divisors is an integer number (302995071).

Almost surely, 2^1211222141 is an apocalyptic number.

It is an amenable number.

1211222141 is a deficient number, since it is larger than the sum of its proper divisors (758143).

1211222141 is an equidigital number, since it uses as much as digits as its factorization.

1211222141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758142.

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

The square root of 1211222141 is about 34802.6168699999. The cubic root of 1211222141 is about 1065.9608808349.

Adding to 1211222141 its reverse (1412221121), we get a palindrome (2623443262).

The spelling of 1211222141 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred forty-one".