21019820088 has 64 divisors (see below), whose sum is σ = 53262374400. Its totient is φ = 6911723520.

The previous prime is 21019820033. The next prime is 21019820089. The reversal of 21019820088 is 88002891012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21019820089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2428248 + ... + 2436888.

It is an arithmetic number, because the mean of its divisors is an integer number (832224600).

Almost surely, 2^21019820088 is an apocalyptic number.

It is an amenable number.

21019820088 is an abundant number, since it is smaller than the sum of its proper divisors (32242554312).

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

21019820088 is a wasteful number, since it uses less digits than its factorization.

21019820088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012 (or 10008 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The spelling of 21019820088 in words is "twenty-one billion, nineteen million, eight hundred twenty thousand, eighty-eight".