21433727 has 20 divisors (see below), whose sum is σ = 25545120. Its totient is φ = 17978688.

The previous prime is 21433703. The next prime is 21433733. The reversal of 21433727 is 72733412.

It is not a de Polignac number, because 21433727 - 2¹⁴ = 21417343 is a prime.

It is a super-2 number, since 2×21433727² = 918809306221058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21433727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433747) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 189623 + ... + 189735.

It is an arithmetic number, because the mean of its divisors is an integer number (1277256).

Almost surely, 2^21433727 is an apocalyptic number.

21433727 is a deficient number, since it is larger than the sum of its proper divisors (4111393).

21433727 is an frugal number, since it uses more digits than its factorization.

21433727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 199 counting only the distinct ones).

The product of its digits is 7056, while the sum is 29.

The square root of 21433727 is about 4629.6573307319. The cubic root of 21433727 is about 277.7788858208.

The spelling of 21433727 in words is "twenty-one million, four hundred thirty-three thousand, seven hundred twenty-seven".