21446345112013 has 4 divisors (see below), whose sum is σ = 21447904746528. Its totient is φ = 21444785477500.

The previous prime is 21446345111963. The next prime is 21446345112103. The reversal of 21446345112013 is 31021154364412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21446345112013 - 2⁹ = 21446345111501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446345112713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779796631 + ... + 779824132.

It is an arithmetic number, because the mean of its divisors is an integer number (5361976186632).

Almost surely, 2^{21446345112013} is an apocalyptic number.

It is an amenable number.

21446345112013 is a deficient number, since it is larger than the sum of its proper divisors (1559634515).

21446345112013 is a wasteful number, since it uses less digits than its factorization.

21446345112013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559634514.

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21446345112013 its reverse (31021154364412), we get a palindrome (52467499476425).

The spelling of 21446345112013 in words is "twenty-one trillion, four hundred forty-six billion, three hundred forty-five million, one hundred twelve thousand, thirteen".