1211213110 has 16 divisors (see below), whose sum is σ = 2308430016. Its totient is φ = 455986048.

The previous prime is 1211213071. The next prime is 1211213111. The reversal of 1211213110 is 113121121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211213111) by changing a digit.

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, 3562222 + ... + 3562561.

It is an arithmetic number, because the mean of its divisors is an integer number (144276876).

Almost surely, 2^1211213110 is an apocalyptic number.

1211213110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211213110 is a deficient number, since it is larger than the sum of its proper divisors (1097216906).

1211213110 is a wasteful number, since it uses less digits than its factorization.

1211213110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124807.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211213110 is about 34802.4871237675. The cubic root of 1211213110 is about 1065.9582315228.

Adding to 1211213110 its reverse (113121121), we get a palindrome (1324334231).

The spelling of 1211213110 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, one hundred ten".