1213111310 has 16 divisors (see below), whose sum is σ = 2278539936. Its totient is φ = 464146848.

The previous prime is 1213111307. The next prime is 1213111327. The reversal of 1213111310 is 131113121.

It is a happy number.

It is a super-2 number, since 2×1213111310² = 2943278100899832200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2636969 + ... + 2637428.

It is an arithmetic number, because the mean of its divisors is an integer number (142408746).

Almost surely, 2^1213111310 is an apocalyptic number.

1213111310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213111310 is a deficient number, since it is larger than the sum of its proper divisors (1065428626).

1213111310 is a wasteful number, since it uses less digits than its factorization.

1213111310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274427.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1213111310 is about 34829.7474868825. The cubic root of 1213111310 is about 1066.5147935899.

Adding to 1213111310 its reverse (131113121), we get a palindrome (1344224431).

The spelling of 1213111310 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, three hundred ten".