1151938221 has 16 divisors (see below), whose sum is σ = 1767120000. Its totient is φ = 653830848.

The previous prime is 1151938217. The next prime is 1151938247. The reversal of 1151938221 is 1228391511.

It is not a de Polignac number, because 1151938221 - 2² = 1151938217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151938201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180946 + ... + 187203.

It is an arithmetic number, because the mean of its divisors is an integer number (110445000).

Almost surely, 2^1151938221 is an apocalyptic number.

It is an amenable number.

1151938221 is a deficient number, since it is larger than the sum of its proper divisors (615181779).

1151938221 is a wasteful number, since it uses less digits than its factorization.

1151938221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368308.

The product of its digits is 4320, while the sum is 33.

The square root of 1151938221 is about 33940.2153941309. The cubic root of 1151938221 is about 1048.2778181376.

The spelling of 1151938221 in words is "one billion, one hundred fifty-one million, nine hundred thirty-eight thousand, two hundred twenty-one".