1221030110 has 32 divisors (see below), whose sum is σ = 2238084000. Its totient is φ = 479521152.

The previous prime is 1221030073. The next prime is 1221030113. The reversal of 1221030110 is 110301221.

It is a super-2 number, since 2×1221030110² = 2981829059053224200, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221030091 and 1221030100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221030113) 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, 209516 + ... + 215264.

It is an arithmetic number, because the mean of its divisors is an integer number (69940125).

Almost surely, 2^1221030110 is an apocalyptic number.

1221030110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221030110 is a deficient number, since it is larger than the sum of its proper divisors (1017053890).

1221030110 is a wasteful number, since it uses less digits than its factorization.

1221030110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1221030110 is about 34943.2412635119. The cubic root of 1221030110 is about 1068.8303841138.

Adding to 1221030110 its reverse (110301221), we get a palindrome (1331331331).

The spelling of 1221030110 in words is "one billion, two hundred twenty-one million, thirty thousand, one hundred ten".