1212000020001 has 12 divisors (see below), whose sum is σ = 1752105221412. Its totient is φ = 807336078336.

The previous prime is 1212000019963. The next prime is 1212000020029. The reversal of 1212000020001 is 1000200002121.

It can be written as a sum of positive squares in 2 ways, for example, as 888449515776 + 323550504225 = 942576^2 + 568815^2 .

It is not a de Polignac number, because 1212000020001 - 2⁷ = 1212000019873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212000520001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55316356 + ... + 55338261.

It is an arithmetic number, because the mean of its divisors is an integer number (146008768451).

Almost surely, 2^{1212000020001} is an apocalyptic number.

It is an amenable number.

1212000020001 is a deficient number, since it is larger than the sum of its proper divisors (540105201411).

1212000020001 is a wasteful number, since it uses less digits than its factorization.

1212000020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110655840 (or 110655837 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1212000020001 its reverse (1000200002121), we get a palindrome (2212200022122).

The spelling of 1212000020001 in words is "one trillion, two hundred twelve billion, twenty thousand, one".