21617338 has 4 divisors (see below), whose sum is σ = 32426010. Its totient is φ = 10808668.

The previous prime is 21617329. The next prime is 21617341. The reversal of 21617338 is 83371612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14768649 + 6848689 = 3843^2 + 2617^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5404333 + ... + 5404336.

Almost surely, 2^21617338 is an apocalyptic number.

21617338 is a deficient number, since it is larger than the sum of its proper divisors (10808672).

21617338 is a wasteful number, since it uses less digits than its factorization.

21617338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10808671.

The product of its digits is 6048, while the sum is 31.

The square root of 21617338 is about 4649.4449131052. Note that the first 3 decimals coincide. The cubic root of 21617338 is about 278.5698247802.

The spelling of 21617338 in words is "twenty-one million, six hundred seventeen thousand, three hundred thirty-eight".