20121112213 has 2 divisors, whose sum is σ = 20121112214. Its totient is φ = 20121112212.

The previous prime is 20121112199. The next prime is 20121112223. The reversal of 20121112213 is 31221112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16595365329 + 3525746884 = 128823^2 + 59378^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121112213 - 2⁵ = 20121112181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121112223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060556106 + 10060556107.

It is an arithmetic number, because the mean of its divisors is an integer number (10060556107).

Almost surely, 2^20121112213 is an apocalyptic number.

It is an amenable number.

20121112213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121112213 is an equidigital number, since it uses as much as digits as its factorization.

20121112213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20121112213 its reverse (31221112102), we get a palindrome (51342224315).

The spelling of 20121112213 in words is "twenty billion, one hundred twenty-one million, one hundred twelve thousand, two hundred thirteen".