1221103310 has 16 divisors (see below), whose sum is σ = 2511984096. Its totient is φ = 418663968.

The previous prime is 1221103309. The next prime is 1221103321. The reversal of 1221103310 is 133011221.

It is a super-2 number, since 2×1221103310² = 2982186587385912200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8722097 + ... + 8722236.

It is an arithmetic number, because the mean of its divisors is an integer number (156999006).

Almost surely, 2^1221103310 is an apocalyptic number.

1221103310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221103310 is an abundant number, since it is smaller than the sum of its proper divisors (1290880786).

1221103310 is a wasteful number, since it uses less digits than its factorization.

1221103310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17444347.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221103310 is about 34944.2886606667. The cubic root of 1221103310 is about 1068.8517422606.

Adding to 1221103310 its reverse (133011221), we get a palindrome (1354114531).

The spelling of 1221103310 in words is "one billion, two hundred twenty-one million, one hundred three thousand, three hundred ten".