21099483840 has 224 divisors, whose sum is σ = 69077433600. Its totient is φ = 5452517376.

The previous prime is 21099483833. The next prime is 21099483901. The reversal of 21099483840 is 4838499012.

It is a super-2 number, since 2×21099483840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21099483840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10051111 + ... + 10053209.

It is an arithmetic number, because the mean of its divisors is an integer number (308381400).

Almost surely, 2^21099483840 is an apocalyptic number.

21099483840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21099483840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34538716800).

21099483840 is an abundant number, since it is smaller than the sum of its proper divisors (47977949760).

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

21099483840 is a wasteful number, since it uses less digits than its factorization.

21099483840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2429 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 21099483840 in words is "twenty-one billion, ninety-nine million, four hundred eighty-three thousand, eight hundred forty".