21404110324 has 12 divisors (see below), whose sum is σ = 37466232804. Its totient is φ = 10699472384.

The previous prime is 21404110319. The next prime is 21404110331. The reversal of 21404110324 is 42301140412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5826574224 + 15577536100 = 76332^2 + 124810^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21404110295 and 21404110304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626989 + ... + 660244.

It is an arithmetic number, because the mean of its divisors is an integer number (3122186067).

Almost surely, 2^21404110324 is an apocalyptic number.

It is an amenable number.

21404110324 is a deficient number, since it is larger than the sum of its proper divisors (16062122480).

21404110324 is a wasteful number, since it uses less digits than its factorization.

21404110324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291394 (or 1291392 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21404110324 its reverse (42301140412), we get a palindrome (63705250736).

The spelling of 21404110324 in words is "twenty-one billion, four hundred four million, one hundred ten thousand, three hundred twenty-four".