21625443 has 12 divisors (see below), whose sum is σ = 35699248. Its totient is φ = 12357360.

The previous prime is 21625397. The next prime is 21625453. The reversal of 21625443 is 34452612.

21625443 is a `hidden beast` number, since 216 + 2 + 5 + 443 = 666.

It is not a de Polignac number, because 21625443 - 2¹⁶ = 21559907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21625453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171568 + ... + 171693.

Almost surely, 2^21625443 is an apocalyptic number.

21625443 is a deficient number, since it is larger than the sum of its proper divisors (14073805).

21625443 is a wasteful number, since it uses less digits than its factorization.

21625443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343274 (or 343271 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21625443 is about 4650.3164408457. The cubic root of 21625443 is about 278.6046352075.

The spelling of 21625443 in words is "twenty-one million, six hundred twenty-five thousand, four hundred forty-three".