1211121110 has 8 divisors (see below), whose sum is σ = 2180018016. Its totient is φ = 484448440.

The previous prime is 1211121091. The next prime is 1211121139. The reversal of 1211121110 is 111211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1211121091 and 1211121100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60556046 + ... + 60556065.

It is an arithmetic number, because the mean of its divisors is an integer number (272502252).

Almost surely, 2^1211121110 is an apocalyptic number.

1211121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211121110 is a deficient number, since it is larger than the sum of its proper divisors (968896906).

1211121110 is a wasteful number, since it uses less digits than its factorization.

1211121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121112118.

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

The square root of 1211121110 is about 34801.1653540510. The cubic root of 1211121110 is about 1065.9312418764.

Adding to 1211121110 its reverse (111211121), we get a palindrome (1322332231).

The spelling of 1211121110 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred ten".