21673272 has 32 divisors (see below), whose sum is σ = 54391680. Its totient is φ = 7196640.

The previous prime is 21673271. The next prime is 21673277. The reversal of 21673272 is 27237612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5197 + ... + 8387.

It is an arithmetic number, because the mean of its divisors is an integer number (1699740).

Almost surely, 2^21673272 is an apocalyptic number.

It is an amenable number.

21673272 is an abundant number, since it is smaller than the sum of its proper divisors (32718408).

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

21673272 is a wasteful number, since it uses less digits than its factorization.

21673272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483 (or 3479 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 21673272 is about 4655.4561538049. The cubic root of 21673272 is about 278.8098806250.

It can be divided in two parts, 21673 and 272, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 21673272 in words is "twenty-one million, six hundred seventy-three thousand, two hundred seventy-two".