21474223320 has 192 divisors, whose sum is σ = 74539584000. Its totient is φ = 4931815680.

The previous prime is 21474223313. The next prime is 21474223363. The reversal of 21474223320 is 2332247412.

It is a super-2 number, since 2×21474223320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 236961 + ... + 314799.

It is an arithmetic number, because the mean of its divisors is an integer number (388227000).

Almost surely, 2^21474223320 is an apocalyptic number.

21474223320 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 21474223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37269792000).

21474223320 is an abundant number, since it is smaller than the sum of its proper divisors (53065360680).

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

21474223320 is a wasteful number, since it uses less digits than its factorization.

21474223320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77894 (or 77879 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The spelling of 21474223320 in words is "twenty-one billion, four hundred seventy-four million, two hundred twenty-three thousand, three hundred twenty".