20121122211877 has 2 divisors, whose sum is σ = 20121122211878. Its totient is φ = 20121122211876.

The previous prime is 20121122211823. The next prime is 20121122212021. The reversal of 20121122211877 is 77811222112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16155504010881 + 3965618200996 = 4019391^2 + 1991386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121122211877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121122211277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060561105938 + 10060561105939.

It is an arithmetic number, because the mean of its divisors is an integer number (10060561105939).

Almost surely, 2^{20121122211877} is an apocalyptic number.

It is an amenable number.

20121122211877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121122211877 is an equidigital number, since it uses as much as digits as its factorization.

20121122211877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 37.

Adding to 20121122211877 its reverse (77811222112102), we get a palindrome (97932344323979).

The spelling of 20121122211877 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, eight hundred seventy-seven".