21004314123 has 32 divisors (see below), whose sum is σ = 31924972800. Its totient is φ = 12176942976.

The previous prime is 21004314119. The next prime is 21004314131. The reversal of 21004314123 is 32141340012.

It is not a de Polignac number, because 21004314123 - 2² = 21004314119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004314123.

It is not an unprimeable number, because it can be changed into a prime (21004314823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53461 + ... + 211817.

It is an arithmetic number, because the mean of its divisors is an integer number (997655400).

Almost surely, 2^21004314123 is an apocalyptic number.

21004314123 is a deficient number, since it is larger than the sum of its proper divisors (10920658677).

21004314123 is a wasteful number, since it uses less digits than its factorization.

21004314123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158571.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21004314123 its reverse (32141340012), we get a palindrome (53145654135).

The spelling of 21004314123 in words is "twenty-one billion, four million, three hundred fourteen thousand, one hundred twenty-three".