21238958 has 8 divisors (see below), whose sum is σ = 34309128. Its totient is φ = 9802584.

The previous prime is 21238949. The next prime is 21238963. The reversal of 21238958 is 85983212.

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

It is a congruent number.

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, 408416 + ... + 408467.

It is an arithmetic number, because the mean of its divisors is an integer number (4288641).

Almost surely, 2^21238958 is an apocalyptic number.

21238958 is a deficient number, since it is larger than the sum of its proper divisors (13070170).

21238958 is a wasteful number, since it uses less digits than its factorization.

21238958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816898.

The product of its digits is 34560, while the sum is 38.

The square root of 21238958 is about 4608.5743999636. The cubic root of 21238958 is about 276.9349289127.

The spelling of 21238958 in words is "twenty-one million, two hundred thirty-eight thousand, nine hundred fifty-eight".