21673652 has 48 divisors (see below), whose sum is σ = 50934912. Its totient is φ = 7793280.

The previous prime is 21673651. The next prime is 21673703. The reversal of 21673652 is 25637612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1298 + ... + 6710.

It is an arithmetic number, because the mean of its divisors is an integer number (1061144).

Almost surely, 2^21673652 is an apocalyptic number.

21673652 is a gapful number since it is divisible by the number (22) 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 21673652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25467456).

21673652 is an abundant number, since it is smaller than the sum of its proper divisors (29261260).

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

21673652 is a wasteful number, since it uses less digits than its factorization.

21673652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448 (or 5446 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 21673652 is about 4655.4969659533. The cubic root of 21673652 is about 278.8115100842.

The spelling of 21673652 in words is "twenty-one million, six hundred seventy-three thousand, six hundred fifty-two".