21313366641 has 48 divisors (see below), whose sum is σ = 37199385600. Its totient is φ = 11487088224.

The previous prime is 21313366619. The next prime is 21313366643. The reversal of 21313366641 is 14666331312.

It is not a de Polignac number, because 21313366641 - 2⁵ = 21313366609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313366596 and 21313366605.

It is not an unprimeable number, because it can be changed into a prime (21313366643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232500 + ... + 310938.

It is an arithmetic number, because the mean of its divisors is an integer number (774987200).

Almost surely, 2^21313366641 is an apocalyptic number.

21313366641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21313366641 is a deficient number, since it is larger than the sum of its proper divisors (15886018959).

21313366641 is a wasteful number, since it uses less digits than its factorization.

21313366641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78698 (or 78695 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

Adding to 21313366641 its reverse (14666331312), we get a palindrome (35979697953).

The spelling of 21313366641 in words is "twenty-one billion, three hundred thirteen million, three hundred sixty-six thousand, six hundred forty-one".