2221012531421 has 2 divisors, whose sum is σ = 2221012531422. Its totient is φ = 2221012531420.

The previous prime is 2221012531393. The next prime is 2221012531427. The reversal of 2221012531421 is 1241352101222.

2221012531421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1995116700196 + 225895831225 = 1412486^2 + 475285^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221012531421 - 2⁶ = 2221012531357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221012531427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110506265710 + 1110506265711.

It is an arithmetic number, because the mean of its divisors is an integer number (1110506265711).

Almost surely, 2^{2221012531421} is an apocalyptic number.

It is an amenable number.

2221012531421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221012531421 is an equidigital number, since it uses as much as digits as its factorization.

2221012531421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 2221012531421 its reverse (1241352101222), we get a palindrome (3462364632643).

The spelling of 2221012531421 in words is "two trillion, two hundred twenty-one billion, twelve million, five hundred thirty-one thousand, four hundred twenty-one".