20121210011 has 24 divisors (see below), whose sum is σ = 23739287040. Its totient is φ = 17002297872.

The previous prime is 20121209993. The next prime is 20121210017. The reversal of 20121210011 is 11001212102.

It is a de Polignac number, because none of the positive numbers 2^k-20121210011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121209974 and 20121210001.

It is not an unprimeable number, because it can be changed into a prime (20121210017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1975550 + ... + 1985708.

It is an arithmetic number, because the mean of its divisors is an integer number (989136960).

Almost surely, 2^20121210011 is an apocalyptic number.

20121210011 is a deficient number, since it is larger than the sum of its proper divisors (3618077029).

20121210011 is a wasteful number, since it uses less digits than its factorization.

20121210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10743 (or 10736 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121210011 its reverse (11001212102), we get a palindrome (31122422113).

The spelling of 20121210011 in words is "twenty billion, one hundred twenty-one million, two hundred ten thousand, eleven".