21903560897 has 2 divisors, whose sum is σ = 21903560898. Its totient is φ = 21903560896.

The previous prime is 21903560881. The next prime is 21903560927. The reversal of 21903560897 is 79806530912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20662337536 + 1241223361 = 143744^2 + 35231^2 .

It is a cyclic number.

It is not a de Polignac number, because 21903560897 - 2⁴ = 21903560881 is a prime.

It is not a weakly prime, because it can be changed into another prime (21903560807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951780448 + 10951780449.

It is an arithmetic number, because the mean of its divisors is an integer number (10951780449).

Almost surely, 2^21903560897 is an apocalyptic number.

It is an amenable number.

21903560897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21903560897 is an equidigital number, since it uses as much as digits as its factorization.

21903560897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 21903560897 in words is "twenty-one billion, nine hundred three million, five hundred sixty thousand, eight hundred ninety-seven".