21841432 has 8 divisors (see below), whose sum is σ = 40952700. Its totient is φ = 10920712.

The previous prime is 21841427. The next prime is 21841439. The reversal of 21841432 is 23414812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21841397 and 21841406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365082 + ... + 1365097.

Almost surely, 2^21841432 is an apocalyptic number.

It is an amenable number.

21841432 is a deficient number, since it is larger than the sum of its proper divisors (19111268).

21841432 is a wasteful number, since it uses less digits than its factorization.

21841432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730185 (or 2730181 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 21841432 is about 4673.4817855642. The cubic root of 21841432 is about 279.5291064720.

The spelling of 21841432 in words is "twenty-one million, eight hundred forty-one thousand, four hundred thirty-two".