21393361088 has 56 divisors (see below), whose sum is σ = 46618696704. Its totient is φ = 9659808000.

The previous prime is 21393361021. The next prime is 21393361097. The reversal of 21393361088 is 88016339312.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5681 + ... + 206927.

Almost surely, 2^21393361088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21393361088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23309348352).

21393361088 is an abundant number, since it is smaller than the sum of its proper divisors (25225335616).

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

21393361088 is a wasteful number, since it uses less digits than its factorization.

21393361088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201421 (or 201411 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 21393361088 in words is "twenty-one billion, three hundred ninety-three million, three hundred sixty-one thousand, eighty-eight".