21126963 has 40 divisors (see below), whose sum is σ = 34271440. Its totient is φ = 11499840.

The previous prime is 21126961. The next prime is 21126967. The reversal of 21126963 is 36962112.

It is not a de Polignac number, because 21126963 - 2¹ = 21126961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21126963.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 570981 + ... + 571017.

It is an arithmetic number, because the mean of its divisors is an integer number (856786).

Almost surely, 2^21126963 is an apocalyptic number.

21126963 is a deficient number, since it is larger than the sum of its proper divisors (13144477).

21126963 is an equidigital number, since it uses as much as digits as its factorization.

21126963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 64 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 21126963 is about 4596.4076189999. The cubic root of 21126963 is about 276.4473029315.

The spelling of 21126963 in words is "twenty-one million, one hundred twenty-six thousand, nine hundred sixty-three".