21673120 has 96 divisors (see below), whose sum is σ = 60213888. Its totient is φ = 7216128.

The previous prime is 21673103. The next prime is 21673139. The reversal of 21673120 is 2137612.

It is a junction number, because it is equal to n+sod(n) for n = 21673091 and 21673100.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41179 + ... + 41701.

It is an arithmetic number, because the mean of its divisors is an integer number (627228).

Almost surely, 2^21673120 is an apocalyptic number.

21673120 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 21673120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30106944).

21673120 is an abundant number, since it is smaller than the sum of its proper divisors (38540768).

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

21673120 is a wasteful number, since it uses less digits than its factorization.

21673120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21673120 is about 4655.4398288454. The cubic root of 21673120 is about 278.8092288360.

The spelling of 21673120 in words is "twenty-one million, six hundred seventy-three thousand, one hundred twenty".