21650112013 has 4 divisors (see below), whose sum is σ = 21662068608. Its totient is φ = 21638155420.

The previous prime is 21650111981. The next prime is 21650112047. The reversal of 21650112013 is 31021105612.

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 21650112013 - 2⁵ = 21650111981 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 (21650112053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5975581 + ... + 5979202.

It is an arithmetic number, because the mean of its divisors is an integer number (5415517152).

Almost surely, 2^21650112013 is an apocalyptic number.

It is an amenable number.

21650112013 is a deficient number, since it is larger than the sum of its proper divisors (11956595).

21650112013 is a wasteful number, since it uses less digits than its factorization.

21650112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11956594.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 21650112013 its reverse (31021105612), we get a palindrome (52671217625).

The spelling of 21650112013 in words is "twenty-one billion, six hundred fifty million, one hundred twelve thousand, thirteen".