20121221201027 has 2 divisors, whose sum is σ = 20121221201028. Its totient is φ = 20121221201026.

The previous prime is 20121221201009. The next prime is 20121221201051. The reversal of 20121221201027 is 72010212212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121221201027 - 2³⁸ = 19846343294083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121221200993 and 20121221201011.

It is not a weakly prime, because it can be changed into another prime (20121221201827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060610600513 + 10060610600514.

It is an arithmetic number, because the mean of its divisors is an integer number (10060610600514).

Almost surely, 2^{20121221201027} is an apocalyptic number.

20121221201027 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121221201027 is an equidigital number, since it uses as much as digits as its factorization.

20121221201027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 20121221201027 its reverse (72010212212102), we get a palindrome (92131433413129).

The spelling of 20121221201027 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, twenty-seven".