21033109963 has 2 divisors, whose sum is σ = 21033109964. Its totient is φ = 21033109962.

The previous prime is 21033109961. The next prime is 21033109997. The reversal of 21033109963 is 36990133012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21033109963 - 2¹ = 21033109961 is a prime.

It is a super-2 number, since 2×21033109963² (a number of 21 digits) contains 22 as substring.

Together with 21033109961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21033109961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516554981 + 10516554982.

It is an arithmetic number, because the mean of its divisors is an integer number (10516554982).

Almost surely, 2^21033109963 is an apocalyptic number.

21033109963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033109963 is an equidigital number, since it uses as much as digits as its factorization.

21033109963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The spelling of 21033109963 in words is "twenty-one billion, thirty-three million, one hundred nine thousand, nine hundred sixty-three".