2205431223521 has 2 divisors, whose sum is σ = 2205431223522. Its totient is φ = 2205431223520.

The previous prime is 2205431223517. The next prime is 2205431223551. The reversal of 2205431223521 is 1253221345022.

2205431223521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1244072544400 + 961358679121 = 1115380^2 + 980489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205431223521 - 2² = 2205431223517 is a prime.

It is not a weakly prime, because it can be changed into another prime (2205431223551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102715611760 + 1102715611761.

It is an arithmetic number, because the mean of its divisors is an integer number (1102715611761).

Almost surely, 2^{2205431223521} is an apocalyptic number.

It is an amenable number.

2205431223521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205431223521 is an equidigital number, since it uses as much as digits as its factorization.

2205431223521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 2205431223521 its reverse (1253221345022), we get a palindrome (3458652568543).

The spelling of 2205431223521 in words is "two trillion, two hundred five billion, four hundred thirty-one million, two hundred twenty-three thousand, five hundred twenty-one".