21404123310 has 16 divisors (see below), whose sum is σ = 51369896016. Its totient is φ = 5707766208.

The previous prime is 21404123281. The next prime is 21404123317. The reversal of 21404123310 is 1332140412.

It is a super-2 number, since 2×21404123310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404123317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356735359 + ... + 356735418.

It is an arithmetic number, because the mean of its divisors is an integer number (3210618501).

Almost surely, 2^21404123310 is an apocalyptic number.

21404123310 is an abundant number, since it is smaller than the sum of its proper divisors (29965772706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404123310 is a wasteful number, since it uses less digits than its factorization.

21404123310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713470787.

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

Adding to 21404123310 its reverse (1332140412), we get a palindrome (22736263722).

The spelling of 21404123310 in words is "twenty-one billion, four hundred four million, one hundred twenty-three thousand, three hundred ten".