1216111310 has 16 divisors (see below), whose sum is σ = 2211569136. Its totient is φ = 481429248.

The previous prime is 1216111297. The next prime is 1216111313. The reversal of 1216111310 is 131116121.

It is a super-2 number, since 2×1216111310² = 2957853436619832200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216111313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625892 + ... + 627831.

It is an arithmetic number, because the mean of its divisors is an integer number (138223071).

Almost surely, 2^1216111310 is an apocalyptic number.

1216111310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216111310 is a deficient number, since it is larger than the sum of its proper divisors (995457826).

1216111310 is a wasteful number, since it uses less digits than its factorization.

1216111310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253827.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1216111310 is about 34872.7875283867. The cubic root of 1216111310 is about 1067.3932264543.

Adding to 1216111310 its reverse (131116121), we get a palindrome (1347227431).

The spelling of 1216111310 in words is "one billion, two hundred sixteen million, one hundred eleven thousand, three hundred ten".