221021235055013 has 2 divisors, whose sum is σ = 221021235055014. Its totient is φ = 221021235055012.

The previous prime is 221021235055003. The next prime is 221021235055043. The reversal of 221021235055013 is 310550532120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215702593591489 + 5318641463524 = 14686817^2 + 2306218^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021235055013 - 2¹⁰ = 221021235053989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021235055003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510617527506 + 110510617527507.

It is an arithmetic number, because the mean of its divisors is an integer number (110510617527507).

Almost surely, 2^{221021235055013} is an apocalyptic number.

It is an amenable number.

221021235055013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021235055013 is an equidigital number, since it uses as much as digits as its factorization.

221021235055013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 221021235055013 its reverse (310550532120122), we get a palindrome (531571767175135).

The spelling of 221021235055013 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred thirty-five million, fifty-five thousand, thirteen".