21063123 has 6 divisors (see below), whose sum is σ = 30424524. Its totient is φ = 14042076.

The previous prime is 21063121. The next prime is 21063131. The reversal of 21063123 is 32136012.

21063123 is a `hidden beast` number, since 2 + 10 + 631 + 23 = 666.

It is not a de Polignac number, because 21063123 - 2¹ = 21063121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21063096 and 21063105.

It is not an unprimeable number, because it can be changed into a prime (21063121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1170165 + ... + 1170182.

It is an arithmetic number, because the mean of its divisors is an integer number (5070754).

Almost surely, 2^21063123 is an apocalyptic number.

21063123 is a deficient number, since it is larger than the sum of its proper divisors (9361401).

21063123 is a wasteful number, since it uses less digits than its factorization.

21063123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340353 (or 2340350 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 21063123 is about 4589.4578111145. The cubic root of 21063123 is about 276.1685721937.

Adding to 21063123 its reverse (32136012), we get a palindrome (53199135).

The spelling of 21063123 in words is "twenty-one million, sixty-three thousand, one hundred twenty-three".