20121212210101 has 2 divisors, whose sum is σ = 20121212210102. Its totient is φ = 20121212210100.

The previous prime is 20121212210093. The next prime is 20121212210123. The reversal of 20121212210101 is 10101221212102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19365051529476 + 756160680625 = 4400574^2 + 869575^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121212210101 - 2³ = 20121212210093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121212610101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060606105050 + 10060606105051.

It is an arithmetic number, because the mean of its divisors is an integer number (10060606105051).

Almost surely, 2^{20121212210101} is an apocalyptic number.

It is an amenable number.

20121212210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121212210101 is an equidigital number, since it uses as much as digits as its factorization.

20121212210101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121212210101 its reverse (10101221212102), we get a palindrome (30222433422203).

The spelling of 20121212210101 in words is "twenty trillion, one hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred one".