21112413421 has 8 divisors (see below), whose sum is σ = 23235545664. Its totient is φ = 19023251520.

The previous prime is 21112413401. The next prime is 21112413431. The reversal of 21112413421 is 12431421112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112413421 - 2⁵ = 21112413389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112413392 and 21112413401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112413401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8491281 + ... + 8493766.

It is an arithmetic number, because the mean of its divisors is an integer number (2904443208).

Almost surely, 2^21112413421 is an apocalyptic number.

It is an amenable number.

21112413421 is a deficient number, since it is larger than the sum of its proper divisors (2123132243).

21112413421 is a wasteful number, since it uses less digits than its factorization.

21112413421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16985171.

The product of its digits is 384, while the sum is 22.

Adding to 21112413421 its reverse (12431421112), we get a palindrome (33543834533).

The spelling of 21112413421 in words is "twenty-one billion, one hundred twelve million, four hundred thirteen thousand, four hundred twenty-one".