21411110204421 has 16 divisors (see below), whose sum is σ = 32637465030144. Its totient is φ = 12230790847344.

The previous prime is 21411110204411. The next prime is 21411110204437. The reversal of 21411110204421 is 12440201111412.

It is not a de Polignac number, because 21411110204421 - 2⁶ = 21411110204357 is a prime.

It is a super-2 number, since 2×21411110204421² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21411110204391 and 21411110204400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411110204411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171989191 + ... + 172113636.

It is an arithmetic number, because the mean of its divisors is an integer number (2039841564384).

Almost surely, 2^{21411110204421} is an apocalyptic number.

21411110204421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21411110204421 is a deficient number, since it is larger than the sum of its proper divisors (11226354825723).

21411110204421 is a wasteful number, since it uses less digits than its factorization.

21411110204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344105800.

The product of its (nonzero) digits is 512, while the sum is 24.

Adding to 21411110204421 its reverse (12440201111412), we get a palindrome (33851311315833).

The spelling of 21411110204421 in words is "twenty-one trillion, four hundred eleven billion, one hundred ten million, two hundred four thousand, four hundred twenty-one".