21633671153 has 2 divisors, whose sum is σ = 21633671154. Its totient is φ = 21633671152.

The previous prime is 21633671099. The next prime is 21633671159. The reversal of 21633671153 is 35117633612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12067461904 + 9566209249 = 109852^2 + 97807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21633671153 - 2⁸ = 21633670897 is a prime.

It is a super-2 number, since 2×21633671153² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21633671159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816835576 + 10816835577.

It is an arithmetic number, because the mean of its divisors is an integer number (10816835577).

Almost surely, 2^21633671153 is an apocalyptic number.

It is an amenable number.

21633671153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21633671153 is an equidigital number, since it uses as much as digits as its factorization.

21633671153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The spelling of 21633671153 in words is "twenty-one billion, six hundred thirty-three million, six hundred seventy-one thousand, one hundred fifty-three".