21939234 has 8 divisors (see below), whose sum is σ = 43878480. Its totient is φ = 7313076.

The previous prime is 21939233. The next prime is 21939241. The reversal of 21939234 is 43293912.

It is a sphenic number, since it is the product of 3 distinct primes.

21939234 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21939195 and 21939204.

It is not an unprimeable number, because it can be changed into a prime (21939233) 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, 1828264 + ... + 1828275.

It is an arithmetic number, because the mean of its divisors is an integer number (5484810).

Almost surely, 2^21939234 is an apocalyptic number.

21939234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21939234 is a wasteful number, since it uses less digits than its factorization.

21939234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656544.

The product of its digits is 11664, while the sum is 33.

The square root of 21939234 is about 4683.9336032869. The cubic root of 21939234 is about 279.9457122642.

The spelling of 21939234 in words is "twenty-one million, nine hundred thirty-nine thousand, two hundred thirty-four".