22221210222521 has 2 divisors, whose sum is σ = 22221210222522. Its totient is φ = 22221210222520.

The previous prime is 22221210222517. The next prime is 22221210222569. The reversal of 22221210222521 is 12522201212222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21365518621225 + 855691601296 = 4622285^2 + 925036^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221210222521 - 2² = 22221210222517 is a prime.

It is not a weakly prime, because it can be changed into another prime (22221210222511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110605111260 + 11110605111261.

It is an arithmetic number, because the mean of its divisors is an integer number (11110605111261).

Almost surely, 2^{22221210222521} is an apocalyptic number.

It is an amenable number.

22221210222521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221210222521 is an equidigital number, since it uses as much as digits as its factorization.

22221210222521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 22221210222521 its reverse (12522201212222), we get a palindrome (34743411434743).

The spelling of 22221210222521 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-two thousand, five hundred twenty-one".