1221110331 has 12 divisors (see below), whose sum is σ = 1893967272. Its totient is φ = 697777248.

The previous prime is 1221110329. The next prime is 1221110353. The reversal of 1221110331 is 1330111221.

It is a happy number.

It is not a de Polignac number, because 1221110331 - 2¹ = 1221110329 is a prime.

It is a super-2 number, since 2×1221110331² = 2982220880949859122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221110331.

It is not an unprimeable number, because it can be changed into a prime (1221110321) 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, 4153290 + ... + 4153583.

It is an arithmetic number, because the mean of its divisors is an integer number (157830606).

Almost surely, 2^1221110331 is an apocalyptic number.

1221110331 is a deficient number, since it is larger than the sum of its proper divisors (672856941).

1221110331 is an equidigital number, since it uses as much as digits as its factorization.

1221110331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8306890 (or 8306883 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1221110331 is about 34944.3891204296. The cubic root of 1221110331 is about 1068.8537907888.

Adding to 1221110331 its reverse (1330111221), we get a palindrome (2551221552).

The spelling of 1221110331 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, three hundred thirty-one".