20121211013 has 4 divisors (see below), whose sum is σ = 20770282368. Its totient is φ = 19472139660.

The previous prime is 20121211001. The next prime is 20121211021. The reversal of 20121211013 is 31011212102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121211013 - 2¹⁴ = 20121194629 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 (20121211613) 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, 324535631 + ... + 324535692.

It is an arithmetic number, because the mean of its divisors is an integer number (5192570592).

Almost surely, 2^20121211013 is an apocalyptic number.

It is an amenable number.

20121211013 is a deficient number, since it is larger than the sum of its proper divisors (649071355).

20121211013 is an equidigital number, since it uses as much as digits as its factorization.

20121211013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649071354.

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

Adding to 20121211013 its reverse (31011212102), we get a palindrome (51132423115).

The spelling of 20121211013 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, thirteen".