21113203330405 has 16 divisors (see below), whose sum is σ = 25551112366080. Its totient is φ = 16747214726592.

The previous prime is 21113203330399. The next prime is 21113203330409. The reversal of 21113203330405 is 50403330231112.

It is a cyclic number.

It is not a de Polignac number, because 21113203330405 - 2⁹ = 21113203329893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113203330409) 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, 9240354 + ... + 11296483.

It is an arithmetic number, because the mean of its divisors is an integer number (1596944522880).

Almost surely, 2^{21113203330405} is an apocalyptic number.

It is an amenable number.

21113203330405 is a deficient number, since it is larger than the sum of its proper divisors (4437909035675).

21113203330405 is a wasteful number, since it uses less digits than its factorization.

21113203330405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20538588.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 21113203330405 its reverse (50403330231112), we get a palindrome (71516533561517).

The spelling of 21113203330405 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, three hundred thirty thousand, four hundred five".