21311163642 has 8 divisors (see below), whose sum is σ = 42622327296. Its totient is φ = 7103721212.

The previous prime is 21311163539. The next prime is 21311163647. The reversal of 21311163642 is 24636111312.

It is a sphenic number, since it is the product of 3 distinct primes.

21311163642 is an admirable number.

It is a super-2 number, since 2×21311163642² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21311163647) 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, 1775930298 + ... + 1775930309.

It is an arithmetic number, because the mean of its divisors is an integer number (5327790912).

Almost surely, 2^21311163642 is an apocalyptic number.

21311163642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311163642 is a wasteful number, since it uses less digits than its factorization.

21311163642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551860612.

The product of its digits is 5184, while the sum is 30.

Adding to 21311163642 its reverse (24636111312), we get a palindrome (45947274954).

The spelling of 21311163642 in words is "twenty-one billion, three hundred eleven million, one hundred sixty-three thousand, six hundred forty-two".