21736452 has 12 divisors (see below), whose sum is σ = 50718416. Its totient is φ = 7245480.

The previous prime is 21736447. The next prime is 21736459. The reversal of 21736452 is 25463712.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21736459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905674 + ... + 905697.

Almost surely, 2^21736452 is an apocalyptic number.

It is an amenable number.

21736452 is an abundant number, since it is smaller than the sum of its proper divisors (28981964).

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

21736452 is a wasteful number, since it uses less digits than its factorization.

21736452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811378 (or 1811376 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 21736452 is about 4662.2368022227. The cubic root of 21736452 is about 279.0805384066.

The spelling of 21736452 in words is "twenty-one million, seven hundred thirty-six thousand, four hundred fifty-two".