20121212011 has 2 divisors, whose sum is σ = 20121212012. Its totient is φ = 20121212010.

The previous prime is 20121211967. The next prime is 20121212099. The reversal of 20121212011 is 11021212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121212011 - 2¹³ = 20121203819 is a prime.

It is a super-2 number, since 2×20121212011² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121211982 and 20121212000.

It is not a weakly prime, because it can be changed into another prime (20121212311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060606005 + 10060606006.

It is an arithmetic number, because the mean of its divisors is an integer number (10060606006).

Almost surely, 2^20121212011 is an apocalyptic number.

20121212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121212011 is an equidigital number, since it uses as much as digits as its factorization.

20121212011 is an evil number, because the sum of its binary digits is even.

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

Adding to 20121212011 its reverse (11021212102), we get a palindrome (31142424113).

Subtracting from 20121212011 its reverse (11021212102), we obtain a palindrome (9099999909).

The spelling of 20121212011 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, eleven".