1221011310 has 32 divisors (see below), whose sum is σ = 2931489792. Its totient is φ = 325484960.

The previous prime is 1221011303. The next prime is 1221011357. The reversal of 1221011310 is 131101221.

1221011310 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1221011310² = 2981737238295832200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104587 + ... + 115673.

It is an arithmetic number, because the mean of its divisors is an integer number (91609056).

Almost surely, 2^1221011310 is an apocalyptic number.

1221011310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011310 is an abundant number, since it is smaller than the sum of its proper divisors (1710478482).

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

1221011310 is a wasteful number, since it uses less digits than its factorization.

1221011310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14768.

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

The square root of 1221011310 is about 34942.9722548040. The cubic root of 1221011310 is about 1068.8248985504.

Adding to 1221011310 its reverse (131101221), we get a palindrome (1352112531).

The spelling of 1221011310 in words is "one billion, two hundred twenty-one million, eleven thousand, three hundred ten".