21633225049 has 2 divisors, whose sum is σ = 21633225050. Its totient is φ = 21633225048.

The previous prime is 21633224993. The next prime is 21633225071. The reversal of 21633225049 is 94052233612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19080449424 + 2552775625 = 138132^2 + 50525^2 .

It is a cyclic number.

It is not a de Polignac number, because 21633225049 - 2²¹ = 21631127897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21633224999 and 21633225017.

It is not a weakly prime, because it can be changed into another prime (21633225079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816612524 + 10816612525.

It is an arithmetic number, because the mean of its divisors is an integer number (10816612525).

Almost surely, 2^21633225049 is an apocalyptic number.

It is an amenable number.

21633225049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21633225049 is an equidigital number, since it uses as much as digits as its factorization.

21633225049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 21633225049 in words is "twenty-one billion, six hundred thirty-three million, two hundred twenty-five thousand, forty-nine".