21441672 has 160 divisors (see below), whose sum is σ = 71438400. Its totient is φ = 5878656.

The previous prime is 21441661. The next prime is 21441689. The reversal of 21441672 is 27614412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 131463 + ... + 131625.

It is an arithmetic number, because the mean of its divisors is an integer number (446490).

Almost surely, 2^21441672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21441672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35719200).

21441672 is an abundant number, since it is smaller than the sum of its proper divisors (49996728).

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

21441672 is a wasteful number, since it uses less digits than its factorization.

21441672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 204 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21441672 is about 4630.5153060972. The cubic root of 21441672 is about 277.8132037070.

The spelling of 21441672 in words is "twenty-one million, four hundred forty-one thousand, six hundred seventy-two".