1212100001101 has 40 divisors (see below), whose sum is σ = 1371045191040. Its totient is φ = 1070922600000.

The previous prime is 1212100001083. The next prime is 1212100001141. The reversal of 1212100001101 is 1011000012121.

It is not a de Polignac number, because 1212100001101 - 2²¹ = 1212097903949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212100001141) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 162672426 + ... + 162679876.

It is an arithmetic number, because the mean of its divisors is an integer number (34276129776).

Almost surely, 2^{1212100001101} is an apocalyptic number.

1212100001101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212100001101 is a deficient number, since it is larger than the sum of its proper divisors (158945189939).

1212100001101 is an frugal number, since it uses more digits than its factorization.

1212100001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7807 (or 7774 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1212100001101 its reverse (1011000012121), we get a palindrome (2223100013222).

The spelling of 1212100001101 in words is "one trillion, two hundred twelve billion, one hundred million, one thousand, one hundred one".