1151120221 has 2 divisors, whose sum is σ = 1151120222. Its totient is φ = 1151120220.

The previous prime is 1151120207. The next prime is 1151120239. The reversal of 1151120221 is 1220211511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 955428100 + 195692121 = 30910^2 + 13989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151120221 - 2⁵ = 1151120189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1151120195 and 1151120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151120821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575560110 + 575560111.

It is an arithmetic number, because the mean of its divisors is an integer number (575560111).

Almost surely, 2^1151120221 is an apocalyptic number.

It is an amenable number.

1151120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151120221 is an equidigital number, since it uses as much as digits as its factorization.

1151120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 1151120221 is about 33928.1626528759. The cubic root of 1151120221 is about 1048.0296293922.

Adding to 1151120221 its reverse (1220211511), we get a palindrome (2371331732).

The spelling of 1151120221 in words is "one billion, one hundred fifty-one million, one hundred twenty thousand, two hundred twenty-one".