21331121013403 has 16 divisors (see below), whose sum is σ = 22275899654976. Its totient is φ = 20387791226880.

The previous prime is 21331121013359. The next prime is 21331121013431. The reversal of 21331121013403 is 30431012113312.

It is a cyclic number.

It is not a de Polignac number, because 21331121013403 - 2⁹ = 21331121012891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331121013703) 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, 261520675 + ... + 261602227.

It is an arithmetic number, because the mean of its divisors is an integer number (1392243728436).

Almost surely, 2^{21331121013403} is an apocalyptic number.

21331121013403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21331121013403 is a deficient number, since it is larger than the sum of its proper divisors (944778641573).

21331121013403 is a wasteful number, since it uses less digits than its factorization.

21331121013403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90294.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21331121013403 its reverse (30431012113312), we get a palindrome (51762133126715).

The spelling of 21331121013403 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred twenty-one million, thirteen thousand, four hundred three".