21858038 has 8 divisors (see below), whose sum is σ = 33844800. Its totient is φ = 10576440.

The previous prime is 21858029. The next prime is 21858127. The reversal of 21858038 is 83085812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21857989 and 21858007.

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, 176213 + ... + 176336.

It is an arithmetic number, because the mean of its divisors is an integer number (4230600).

Almost surely, 2^21858038 is an apocalyptic number.

21858038 is a deficient number, since it is larger than the sum of its proper divisors (11986762).

21858038 is a wasteful number, since it uses less digits than its factorization.

21858038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352582.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 21858038 is about 4675.2580677434. The cubic root of 21858038 is about 279.5999303453.

The spelling of 21858038 in words is "twenty-one million, eight hundred fifty-eight thousand, thirty-eight".