221110010521 has 2 divisors, whose sum is σ = 221110010522. Its totient is φ = 221110010520.

The previous prime is 221110010503. The next prime is 221110010543. The reversal of 221110010521 is 125010011122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219998521600 + 1111488921 = 469040^2 + 33339^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110010521 - 2⁵ = 221110010489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221110010495 and 221110010504.

It is not a weakly prime, because it can be changed into another prime (221110010551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555005260 + 110555005261.

It is an arithmetic number, because the mean of its divisors is an integer number (110555005261).

Almost surely, 2^221110010521 is an apocalyptic number.

It is an amenable number.

221110010521 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110010521 is an equidigital number, since it uses as much as digits as its factorization.

221110010521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 221110010521 its reverse (125010011122), we get a palindrome (346120021643).

The spelling of 221110010521 in words is "two hundred twenty-one billion, one hundred ten million, ten thousand, five hundred twenty-one".