1211211110 has 16 divisors (see below), whose sum is σ = 2200557456. Its totient is φ = 479956128.

The previous prime is 1211211077. The next prime is 1211211203. The reversal of 1211211110 is 111121121.

It is a junction number, because it is equal to n+sod(n) for n = 1211211091 and 1211211100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564917 + ... + 567056.

It is an arithmetic number, because the mean of its divisors is an integer number (137534841).

Almost surely, 2^1211211110 is an apocalyptic number.

1211211110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211211110 is a deficient number, since it is larger than the sum of its proper divisors (989346346).

1211211110 is a wasteful number, since it uses less digits than its factorization.

1211211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132087.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1211211110 is about 34802.4583901770. The cubic root of 1211211110 is about 1065.9576448058.

Adding to 1211211110 its reverse (111121121), we get a palindrome (1322332231).

The spelling of 1211211110 in words is "one billion, two hundred eleven million, two hundred eleven thousand, one hundred ten".