21103411401421 has 4 divisors (see below), whose sum is σ = 21104783282592. Its totient is φ = 21102039520252.

The previous prime is 21103411401361. The next prime is 21103411401461. The reversal of 21103411401421 is 12410411430112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21103411401421 - 2⁹ = 21103411400909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103411401461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685917511 + ... + 685948276.

It is an arithmetic number, because the mean of its divisors is an integer number (5276195820648).

Almost surely, 2^{21103411401421} is an apocalyptic number.

It is an amenable number.

21103411401421 is a deficient number, since it is larger than the sum of its proper divisors (1371881171).

21103411401421 is a wasteful number, since it uses less digits than its factorization.

21103411401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371881170.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 21103411401421 its reverse (12410411430112), we get a palindrome (33513822831533).

The spelling of 21103411401421 in words is "twenty-one trillion, one hundred three billion, four hundred eleven million, four hundred one thousand, four hundred twenty-one".