1211110212100 has 36 divisors (see below), whose sum is σ = 2636505743284. Its totient is φ = 482896327680.

The previous prime is 1211110212097. The next prime is 1211110212121. The reversal of 1211110212100 is 12120111121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 727462291396 + 483647920704 = 852914^2 + 695448^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19315509 + ... + 19378108.

Almost surely, 2^{1211110212100} is an apocalyptic number.

1211110212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211110212100 is an abundant number, since it is smaller than the sum of its proper divisors (1425395531184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211110212100 is a wasteful number, since it uses less digits than its factorization.

1211110212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38693944 (or 38693937 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211110212100 its reverse (12120111121), we get a palindrome (1223230323221).

The spelling of 1211110212100 in words is "one trillion, two hundred eleven billion, one hundred ten million, two hundred twelve thousand, one hundred".