21163925089 has 8 divisors (see below), whose sum is σ = 21240169920. Its totient is φ = 21087788400.

The previous prime is 21163925087. The next prime is 21163925119. The reversal of 21163925089 is 98052936112.

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

It is a cyclic number.

It is not a de Polignac number, because 21163925089 - 2¹ = 21163925087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163925087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375804 + ... + 428434.

It is an arithmetic number, because the mean of its divisors is an integer number (2655021240).

Almost surely, 2^21163925089 is an apocalyptic number.

It is an amenable number.

21163925089 is a deficient number, since it is larger than the sum of its proper divisors (76244831).

21163925089 is a wasteful number, since it uses less digits than its factorization.

21163925089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54071.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 21163925089 in words is "twenty-one billion, one hundred sixty-three million, nine hundred twenty-five thousand, eighty-nine".