21910038017 has 12 divisors (see below), whose sum is σ = 25491489156. Its totient is φ = 18776862720.

The previous prime is 21910037977. The next prime is 21910038041. The reversal of 21910038017 is 71083001912.

It can be written as a sum of positive squares in 2 ways, for example, as 12587942416 + 9322095601 = 112196^2 + 96551^2 .

It is not a de Polignac number, because 21910038017 - 2⁶ = 21910037953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21910038217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283073 + ... + 352065.

It is an arithmetic number, because the mean of its divisors is an integer number (2124290763).

Almost surely, 2^21910038017 is an apocalyptic number.

It is an amenable number.

21910038017 is a deficient number, since it is larger than the sum of its proper divisors (3581451139).

21910038017 is an equidigital number, since it uses as much as digits as its factorization.

21910038017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75488 (or 75481 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 32.

Adding to 21910038017 its reverse (71083001912), we get a palindrome (92993039929).

The spelling of 21910038017 in words is "twenty-one billion, nine hundred ten million, thirty-eight thousand, seventeen".