1151442221 has 4 divisors (see below), whose sum is σ = 1152468672. Its totient is φ = 1150415772.

The previous prime is 1151442209. The next prime is 1151442251. The reversal of 1151442221 is 1222441511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1222441511 = 1321 ⋅925391.

It is a cyclic number.

It is not a de Polignac number, because 1151442221 - 2¹⁸ = 1151180077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151442251) 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, 511541 + ... + 513786.

It is an arithmetic number, because the mean of its divisors is an integer number (288117168).

Almost surely, 2^1151442221 is an apocalyptic number.

It is an amenable number.

1151442221 is a deficient number, since it is larger than the sum of its proper divisors (1026451).

1151442221 is a wasteful number, since it uses less digits than its factorization.

1151442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026450.

The product of its digits is 640, while the sum is 23.

The square root of 1151442221 is about 33932.9076414032. The cubic root of 1151442221 is about 1048.1273411902.

Adding to 1151442221 its reverse (1222441511), we get a palindrome (2373883732).

It can be divided in two parts, 11514 and 42221, that added together give a palindrome (53735).

The spelling of 1151442221 in words is "one billion, one hundred fifty-one million, four hundred forty-two thousand, two hundred twenty-one".