1131221110 has 32 divisors (see below), whose sum is σ = 2074095072. Its totient is φ = 444138240.

The previous prime is 1131221071. The next prime is 1131221111. The reversal of 1131221110 is 111221311.

It is a happy number.

It is a super-2 number, since 2×1131221110² = 2559322399419264200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131221111) 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, 125970 + ... + 134650.

It is an arithmetic number, because the mean of its divisors is an integer number (64815471).

Almost surely, 2^1131221110 is an apocalyptic number.

1131221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1131221110 is a deficient number, since it is larger than the sum of its proper divisors (942873962).

1131221110 is a wasteful number, since it uses less digits than its factorization.

1131221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8928.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1131221110 is about 33633.6306395845. The cubic root of 1131221110 is about 1041.9554893472.

Adding to 1131221110 its reverse (111221311), we get a palindrome (1242442421).

The spelling of 1131221110 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, one hundred ten".