1151005221 has 12 divisors (see below), whose sum is σ = 1724139872. Its totient is φ = 767336652.

The previous prime is 1151005171. The next prime is 1151005223. The reversal of 1151005221 is 1225001511.

It is not a de Polignac number, because 1151005221 - 2¹⁴ = 1150988837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1151005194 and 1151005203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151005223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2368081 + ... + 2368566.

Almost surely, 2^1151005221 is an apocalyptic number.

It is an amenable number.

1151005221 is a deficient number, since it is larger than the sum of its proper divisors (573134651).

1151005221 is an frugal number, since it uses more digits than its factorization.

1151005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736662 (or 4736650 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1151005221 is about 33926.4678532853. The cubic root of 1151005221 is about 1047.9947279055.

Adding to 1151005221 its reverse (1225001511), we get a palindrome (2376006732).

The spelling of 1151005221 in words is "one billion, one hundred fifty-one million, five thousand, two hundred twenty-one".