21401324123 has 8 divisors (see below), whose sum is σ = 22947065280. Its totient is φ = 19887454080.

The previous prime is 21401324081. The next prime is 21401324141. The reversal of 21401324123 is 32142310412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21401324123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401024123) 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, 7966388 + ... + 7969073.

It is an arithmetic number, because the mean of its divisors is an integer number (2868383160).

Almost surely, 2^21401324123 is an apocalyptic number.

21401324123 is a deficient number, since it is larger than the sum of its proper divisors (1545741157).

21401324123 is a wasteful number, since it uses less digits than its factorization.

21401324123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15935557.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21401324123 its reverse (32142310412), we get a palindrome (53543634535).

The spelling of 21401324123 in words is "twenty-one billion, four hundred one million, three hundred twenty-four thousand, one hundred twenty-three".