21634546123 has 2 divisors, whose sum is σ = 21634546124. Its totient is φ = 21634546122.

The previous prime is 21634546081. The next prime is 21634546159. The reversal of 21634546123 is 32164543612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21634546123 - 2¹³ = 21634537931 is a prime.

It is a super-2 number, since 2×21634546123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21634646123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817273061 + 10817273062.

It is an arithmetic number, because the mean of its divisors is an integer number (10817273062).

Almost surely, 2^21634546123 is an apocalyptic number.

21634546123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21634546123 is an equidigital number, since it uses as much as digits as its factorization.

21634546123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 37.

The spelling of 21634546123 in words is "twenty-one billion, six hundred thirty-four million, five hundred forty-six thousand, one hundred twenty-three".