20001212011201 has 4 divisors (see below), whose sum is σ = 20002746683332. Its totient is φ = 19999677339072.

The previous prime is 20001212011199. The next prime is 20001212011273. The reversal of 20001212011201 is 10211021210002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10961237722176 + 9039974289025 = 3310776^2 + 3006655^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001212011201 - 2¹ = 20001212011199 is a prime.

It is a super-2 number, since 2×20001212011201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001212011301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767316516 + ... + 767342581.

It is an arithmetic number, because the mean of its divisors is an integer number (5000686670833).

Almost surely, 2^{20001212011201} is an apocalyptic number.

It is an amenable number.

20001212011201 is a deficient number, since it is larger than the sum of its proper divisors (1534672131).

20001212011201 is a wasteful number, since it uses less digits than its factorization.

20001212011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534672130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001212011201 its reverse (10211021210002), we get a palindrome (30212233221203).

The spelling of 20001212011201 in words is "twenty trillion, one billion, two hundred twelve million, eleven thousand, two hundred one".