21232438 has 16 divisors (see below), whose sum is σ = 32845824. Its totient is φ = 10288360.

The previous prime is 21232429. The next prime is 21232441. The reversal of 21232438 is 83423212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9003 + ... + 11113.

It is an arithmetic number, because the mean of its divisors is an integer number (2052864).

Almost surely, 2^21232438 is an apocalyptic number.

21232438 is a deficient number, since it is larger than the sum of its proper divisors (11613386).

21232438 is a wasteful number, since it uses less digits than its factorization.

21232438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267.

The product of its digits is 2304, while the sum is 25.

The square root of 21232438 is about 4607.8669685658. The cubic root of 21232438 is about 276.9065879031.

The spelling of 21232438 in words is "twenty-one million, two hundred thirty-two thousand, four hundred thirty-eight".