16621033440 has 384 divisors, whose sum is σ = 59156697600. Its totient is φ = 3887308800.

The previous prime is 16621033417. The next prime is 16621033453. The reversal of 16621033440 is 4433012661.

It is a super-2 number, since 2×16621033440² (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 junction number, because it is equal to n+sod(n) for n = 16621033398 and 16621033407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29108355 + ... + 29108925.

It is an arithmetic number, because the mean of its divisors is an integer number (154053900).

Almost surely, 2^16621033440 is an apocalyptic number.

16621033440 is a gapful number since it is divisible by the number (10) 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 16621033440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29578348800).

16621033440 is an abundant number, since it is smaller than the sum of its proper divisors (42535664160).

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

16621033440 is a wasteful number, since it uses less digits than its factorization.

16621033440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 16621033440 in words is "sixteen billion, six hundred twenty-one million, thirty-three thousand, four hundred forty".