20121122212021 has 2 divisors, whose sum is σ = 20121122212022. Its totient is φ = 20121122212020.

The previous prime is 20121122211877. The next prime is 20121122212027. The reversal of 20121122212021 is 12021222112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10614759480900 + 9506362731121 = 3258030^2 + 3083239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121122212021 - 2¹¹ = 20121122209973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121122212021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121122212027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060561106010 + 10060561106011.

It is an arithmetic number, because the mean of its divisors is an integer number (10060561106011).

Almost surely, 2^{20121122212021} is an apocalyptic number.

It is an amenable number.

20121122212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121122212021 is an equidigital number, since it uses as much as digits as its factorization.

20121122212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20121122212021 its reverse (12021222112102), we get a palindrome (32142344324123).

The spelling of 20121122212021 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, twenty-one".