20111212011101 has 4 divisors (see below), whose sum is σ = 20310332922204. Its totient is φ = 19912091100000.

The previous prime is 20111212011061. The next prime is 20111212011113. The reversal of 20111212011101 is 10111021211102.

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 8455126372900 + 11656085638201 = 2907770^2 + 3414101^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111212011101 - 2²² = 20111207816797 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 (20111212031101) 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, 99560455400 + ... + 99560455601.

It is an arithmetic number, because the mean of its divisors is an integer number (5077583230551).

Almost surely, 2^{20111212011101} is an apocalyptic number.

It is an amenable number.

20111212011101 is a deficient number, since it is larger than the sum of its proper divisors (199120911103).

20111212011101 is a wasteful number, since it uses less digits than its factorization.

20111212011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199120911102.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20111212011101 its reverse (10111021211102), we get a palindrome (30222233222203).

The spelling of 20111212011101 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, eleven thousand, one hundred one".