21746225355377 has 2 divisors, whose sum is σ = 21746225355378. Its totient is φ = 21746225355376.

The previous prime is 21746225355329. The next prime is 21746225355473. The reversal of 21746225355377 is 77355352264712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16323991767616 + 5422233587761 = 4040296^2 + 2328569^2 .

It is a cyclic number.

It is not a de Polignac number, because 21746225355377 - 2⁸ = 21746225355121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21746225355677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873112677688 + 10873112677689.

It is an arithmetic number, because the mean of its divisors is an integer number (10873112677689).

Almost surely, 2^{21746225355377} is an apocalyptic number.

It is an amenable number.

21746225355377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21746225355377 is an equidigital number, since it uses as much as digits as its factorization.

21746225355377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088000, while the sum is 59.

The spelling of 21746225355377 in words is "twenty-one trillion, seven hundred forty-six billion, two hundred twenty-five million, three hundred fifty-five thousand, three hundred seventy-seven".