21113103202421 has 8 divisors (see below), whose sum is σ = 21153111655104. Its totient is φ = 21073105355040.

The previous prime is 21113103202381. The next prime is 21113103202447. The reversal of 21113103202421 is 12420230131112.

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 21113103202421 - 2³⁸ = 20838225295477 is a prime.

It is a super-2 number, since 2×21113103202421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113103204421) 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, 1339745 + ... + 6634841.

It is an arithmetic number, because the mean of its divisors is an integer number (2644138956888).

Almost surely, 2^{21113103202421} is an apocalyptic number.

It is an amenable number.

21113103202421 is a deficient number, since it is larger than the sum of its proper divisors (40008452683).

21113103202421 is an equidigital number, since it uses as much as digits as its factorization.

21113103202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302651.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21113103202421 its reverse (12420230131112), we get a palindrome (33533333333533).

The spelling of 21113103202421 in words is "twenty-one trillion, one hundred thirteen billion, one hundred three million, two hundred two thousand, four hundred twenty-one".