21240314123 has 8 divisors (see below), whose sum is σ = 24276206592. Its totient is φ = 18204812136.

The previous prime is 21240314107. The next prime is 21240314143. The reversal of 21240314123 is 32141304212.

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

It is not a de Polignac number, because 21240314123 - 2⁴ = 21240314107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21240314143) 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, 30086 + ... + 208292.

It is an arithmetic number, because the mean of its divisors is an integer number (3034525824).

Almost surely, 2^21240314123 is an apocalyptic number.

21240314123 is a deficient number, since it is larger than the sum of its proper divisors (3035892469).

21240314123 is a wasteful number, since it uses less digits than its factorization.

21240314123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195241.

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

Adding to 21240314123 its reverse (32141304212), we get a palindrome (53381618335).

The spelling of 21240314123 in words is "twenty-one billion, two hundred forty million, three hundred fourteen thousand, one hundred twenty-three".