1131221210 has 96 divisors (see below), whose sum is σ = 2444846976. Its totient is φ = 368928000.

The previous prime is 1131221209. The next prime is 1131221237. The reversal of 1131221210 is 121221311.

It is a super-2 number, since 2×1131221210² = 2559322851907728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11200160 + ... + 11200260.

It is an arithmetic number, because the mean of its divisors is an integer number (25467156).

Almost surely, 2^1131221210 is an apocalyptic number.

1131221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1131221210 is an abundant number, since it is smaller than the sum of its proper divisors (1313625766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131221210 is a wasteful number, since it uses less digits than its factorization.

1131221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1131221210 is about 33633.6321261918. The cubic root of 1131221210 is about 1041.9555200502.

Adding to 1131221210 its reverse (121221311), we get a palindrome (1252442521).

The spelling of 1131221210 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred ten".