20001212100113 has 4 divisors (see below), whose sum is σ = 20002586862900. Its totient is φ = 19999837337328.

The previous prime is 20001212100059. The next prime is 20001212100157. The reversal of 20001212100113 is 31100121210002.

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 11499742330129 + 8501469769984 = 3391127^2 + 2915728^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001212100113 - 2¹⁸ = 20001211837969 is a prime.

It is a super-2 number, since 2×20001212100113² (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 (20001212100313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687359570 + ... + 687388667.

It is an arithmetic number, because the mean of its divisors is an integer number (5000646715725).

Almost surely, 2^{20001212100113} is an apocalyptic number.

It is an amenable number.

20001212100113 is a deficient number, since it is larger than the sum of its proper divisors (1374762787).

20001212100113 is a wasteful number, since it uses less digits than its factorization.

20001212100113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374762786.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20001212100113 its reverse (31100121210002), we get a palindrome (51101333310115).

The spelling of 20001212100113 in words is "twenty trillion, one billion, two hundred twelve million, one hundred thousand, one hundred thirteen".