204226415521 has 2 divisors, whose sum is σ = 204226415522. Its totient is φ = 204226415520.

The previous prime is 204226415479. The next prime is 204226415581. The reversal of 204226415521 is 125514622402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203965140625 + 261274896 = 451625^2 + 16164^2 .

It is a cyclic number.

It is not a de Polignac number, because 204226415521 - 2⁹ = 204226415009 is a prime.

It is a super-2 number, since 2×204226415521² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204226415581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102113207760 + 102113207761.

It is an arithmetic number, because the mean of its divisors is an integer number (102113207761).

Almost surely, 2^204226415521 is an apocalyptic number.

It is an amenable number.

204226415521 is a deficient number, since it is larger than the sum of its proper divisors (1).

204226415521 is an equidigital number, since it uses as much as digits as its factorization.

204226415521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 204226415521 in words is "two hundred four billion, two hundred twenty-six million, four hundred fifteen thousand, five hundred twenty-one".