21427003123 has 8 divisors (see below), whose sum is σ = 21510601920. Its totient is φ = 21343555200.

The previous prime is 21427003109. The next prime is 21427003163. The reversal of 21427003123 is 32130072412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21427003123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21427003163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251161 + ... + 325477.

It is an arithmetic number, because the mean of its divisors is an integer number (2688825240).

Almost surely, 2^21427003123 is an apocalyptic number.

21427003123 is a deficient number, since it is larger than the sum of its proper divisors (83598797).

21427003123 is an equidigital number, since it uses as much as digits as its factorization.

21427003123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75437.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21427003123 its reverse (32130072412), we get a palindrome (53557075535).

The spelling of 21427003123 in words is "twenty-one billion, four hundred twenty-seven million, three thousand, one hundred twenty-three".