20121402233221 has 2 divisors, whose sum is σ = 20121402233222. Its totient is φ = 20121402233220.

The previous prime is 20121402233147. The next prime is 20121402233243. The reversal of 20121402233221 is 12233220412102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11360364624196 + 8761037609025 = 3370514^2 + 2959905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121402233221 - 2¹¹ = 20121402231173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121402233291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060701116610 + 10060701116611.

It is an arithmetic number, because the mean of its divisors is an integer number (10060701116611).

Almost surely, 2^{20121402233221} is an apocalyptic number.

It is an amenable number.

20121402233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121402233221 is an equidigital number, since it uses as much as digits as its factorization.

20121402233221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20121402233221 its reverse (12233220412102), we get a palindrome (32354622645323).

The spelling of 20121402233221 in words is "twenty trillion, one hundred twenty-one billion, four hundred two million, two hundred thirty-three thousand, two hundred twenty-one".