21331013013 has 16 divisors (see below), whose sum is σ = 32046595200. Its totient is φ = 14020382880.

The previous prime is 21331012993. The next prime is 21331013023. The reversal of 21331013013 is 31031013312.

It is a happy number.

21331013013 is a `hidden beast` number, since 213 + 310 + 130 + 13 = 666.

It is not a de Polignac number, because 21331013013 - 2¹⁷ = 21330881941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331013023) 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, 5561728 + ... + 5565561.

It is an arithmetic number, because the mean of its divisors is an integer number (2002912200).

Almost surely, 2^21331013013 is an apocalyptic number.

It is an amenable number.

21331013013 is a deficient number, since it is larger than the sum of its proper divisors (10715582187).

21331013013 is a wasteful number, since it uses less digits than its factorization.

21331013013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11127369 (or 11127363 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21331013013 its reverse (31031013312), we get a palindrome (52362026325).

The spelling of 21331013013 in words is "twenty-one billion, three hundred thirty-one million, thirteen thousand, thirteen".