20111212241 has 4 divisors (see below), whose sum is σ = 20111538084. Its totient is φ = 20110886400.

The previous prime is 20111212229. The next prime is 20111212309. The reversal of 20111212241 is 14221211102.

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 7207161025 + 12904051216 = 84895^2 + 113596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111212241 is a prime.

It is a super-3 number, since 3×20111212241³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20111212141) 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, 38840 + ... + 204281.

It is an arithmetic number, because the mean of its divisors is an integer number (5027884521).

Almost surely, 2^20111212241 is an apocalyptic number.

It is an amenable number.

20111212241 is a deficient number, since it is larger than the sum of its proper divisors (325843).

20111212241 is an equidigital number, since it uses as much as digits as its factorization.

20111212241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325842.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20111212241 its reverse (14221211102), we get a palindrome (34332423343).

The spelling of 20111212241 in words is "twenty billion, one hundred eleven million, two hundred twelve thousand, two hundred forty-one".