20121211000013 has 4 divisors (see below), whose sum is σ = 20451066918108. Its totient is φ = 19791355081920.

The previous prime is 20121210999983. The next prime is 20121211000067. The reversal of 20121211000013 is 31000011212102.

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 712763128009 + 19408447872004 = 844253^2 + 4405502^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121211000013 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 (20121211000313) 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, 164927958956 + ... + 164927959077.

It is an arithmetic number, because the mean of its divisors is an integer number (5112766729527).

Almost surely, 2^{20121211000013} is an apocalyptic number.

It is an amenable number.

20121211000013 is a deficient number, since it is larger than the sum of its proper divisors (329855918095).

20121211000013 is an equidigital number, since it uses as much as digits as its factorization.

20121211000013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329855918094.

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

Adding to 20121211000013 its reverse (31000011212102), we get a palindrome (51121222212115).

The spelling of 20121211000013 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, thirteen", and thus it is an aban number.