21692745149 has 2 divisors, whose sum is σ = 21692745150. Its totient is φ = 21692745148.

The previous prime is 21692745119. The next prime is 21692745167. The reversal of 21692745149 is 94154729612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16561888249 + 5130856900 = 128693^2 + 71630^2 .

It is a cyclic number.

It is not a de Polignac number, because 21692745149 - 2⁸ = 21692744893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21692745097 and 21692745106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21692745119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10846372574 + 10846372575.

It is an arithmetic number, because the mean of its divisors is an integer number (10846372575).

Almost surely, 2^21692745149 is an apocalyptic number.

It is an amenable number.

21692745149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21692745149 is an equidigital number, since it uses as much as digits as its factorization.

21692745149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The spelling of 21692745149 in words is "twenty-one billion, six hundred ninety-two million, seven hundred forty-five thousand, one hundred forty-nine".