221701207010021 has 2 divisors, whose sum is σ = 221701207010022. Its totient is φ = 221701207010020.

The previous prime is 221701207009993. The next prime is 221701207010029. The reversal of 221701207010021 is 120010702107122.

221701207010021 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., 213924995130625 + 7776211879396 = 14626175^2 + 2788586^2 .

It is a cyclic number.

It is not a de Polignac number, because 221701207010021 - 2¹⁸ = 221701206747877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221701207010029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110850603505010 + 110850603505011.

It is an arithmetic number, because the mean of its divisors is an integer number (110850603505011).

Almost surely, 2^{221701207010021} is an apocalyptic number.

It is an amenable number.

221701207010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221701207010021 is an equidigital number, since it uses as much as digits as its factorization.

221701207010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

Adding to 221701207010021 its reverse (120010702107122), we get a palindrome (341711909117143).

The spelling of 221701207010021 in words is "two hundred twenty-one trillion, seven hundred one billion, two hundred seven million, ten thousand, twenty-one".