1212201111 has 48 divisors (see below), whose sum is σ = 1828173312. Its totient is φ = 713581440.

The previous prime is 1212201103. The next prime is 1212201113. The reversal of 1212201111 is 1111022121.

It is not a de Polignac number, because 1212201111 - 2³ = 1212201103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212201113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3872691 + ... + 3873003.

It is an arithmetic number, because the mean of its divisors is an integer number (38086944).

Almost surely, 2^1212201111 is an apocalyptic number.

1212201111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212201111 is a deficient number, since it is larger than the sum of its proper divisors (615972201).

1212201111 is a wasteful number, since it uses less digits than its factorization.

1212201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1212201111 is about 34816.6786325175. The cubic root of 1212201111 is about 1066.2479910372.

Adding to 1212201111 its reverse (1111022121), we get a palindrome (2323223232).

The spelling of 1212201111 in words is "one billion, two hundred twelve million, two hundred one thousand, one hundred eleven".