21089000918 has 8 divisors (see below), whose sum is σ = 31634250312. Its totient is φ = 10544250816.

The previous prime is 21089000917. The next prime is 21089000927. The reversal of 21089000918 is 81900098012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089000917) 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, 9821 + ... + 205607.

It is an arithmetic number, because the mean of its divisors is an integer number (3954281289).

Almost surely, 2^21089000918 is an apocalyptic number.

21089000918 is a deficient number, since it is larger than the sum of its proper divisors (10545249394).

21089000918 is a wasteful number, since it uses less digits than its factorization.

21089000918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249646.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 21089000918 in words is "twenty-one billion, eighty-nine million, nine hundred eighteen", and thus it is an aban number.