10663138921 has 2 divisors, whose sum is σ = 10663138922. Its totient is φ = 10663138920.

The previous prime is 10663138883. The next prime is 10663138943. The reversal of 10663138921 is 12983136601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8832240400 + 1830898521 = 93980^2 + 42789^2 .

It is a cyclic number.

It is not a de Polignac number, because 10663138921 - 2⁷ = 10663138793 is a prime.

It is a super-2 number, since 2×10663138921² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10663130921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331569460 + 5331569461.

It is an arithmetic number, because the mean of its divisors is an integer number (5331569461).

Almost surely, 2^10663138921 is an apocalyptic number.

It is an amenable number.

10663138921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10663138921 is an equidigital number, since it uses as much as digits as its factorization.

10663138921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 10663138921 in words is "ten billion, six hundred sixty-three million, one hundred thirty-eight thousand, nine hundred twenty-one".