21103404213321 has 12 divisors (see below), whose sum is σ = 30482735092420. Its totient is φ = 14068917626400.

The previous prime is 21103404213299. The next prime is 21103404213349. The reversal of 21103404213321 is 12331240430112.

21103404213321 is a `hidden beast` number, since 2 + 1 + 10 + 3 + 404 + 213 + 32 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6888845364921 + 14214558848400 = 2624661^2 + 3770220^2 .

It is not a de Polignac number, because 21103404213321 - 2⁶ = 21103404213257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103404213391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11313375 + ... + 13046043.

Almost surely, 2^{21103404213321} is an apocalyptic number.

It is an amenable number.

21103404213321 is a deficient number, since it is larger than the sum of its proper divisors (9379330879099).

21103404213321 is a wasteful number, since it uses less digits than its factorization.

21103404213321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085976 (or 3085973 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21103404213321 its reverse (12331240430112), we get a palindrome (33434644643433).

The spelling of 21103404213321 in words is "twenty-one trillion, one hundred three billion, four hundred four million, two hundred thirteen thousand, three hundred twenty-one".