21438034 has 8 divisors (see below), whose sum is σ = 32392188. Its totient is φ = 10640640.

The previous prime is 21438029. The next prime is 21438041. The reversal of 21438034 is 43083412.

It can be written as a sum of positive squares in 2 ways, for example, as 18705625 + 2732409 = 4325^2 + 1653^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38847 + ... + 39394.

Almost surely, 2^21438034 is an apocalyptic number.

21438034 is a deficient number, since it is larger than the sum of its proper divisors (10954154).

21438034 is a wasteful number, since it uses less digits than its factorization.

21438034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78380.

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

The square root of 21438034 is about 4630.1224605835. The cubic root of 21438034 is about 277.7974906662.

The spelling of 21438034 in words is "twenty-one million, four hundred thirty-eight thousand, thirty-four".