21683021360 has 480 divisors, whose sum is σ = 70447491072. Its totient is φ = 6098319360.

The previous prime is 21683021359. The next prime is 21683021377. The reversal of 21683021360 is 6312038612.

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 95 ways as a sum of consecutive naturals, for example, 26345909 + ... + 26346731.

Almost surely, 2^21683021360 is an apocalyptic number.

21683021360 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 21683021360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35223745536).

21683021360 is an abundant number, since it is smaller than the sum of its proper divisors (48764469712).

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

21683021360 is a wasteful number, since it uses less digits than its factorization.

21683021360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 21683021360 its reverse (6312038612), we get a palindrome (27995059972).

The spelling of 21683021360 in words is "twenty-one billion, six hundred eighty-three million, twenty-one thousand, three hundred sixty".