21703138 has 8 divisors (see below), whose sum is σ = 33013440. Its totient is φ = 10698660.

The previous prime is 21703133. The next prime is 21703141. The reversal of 21703138 is 83130712.

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

It is not an unprimeable number, because it can be changed into a prime (21703133) 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, 76278 + ... + 76561.

It is an arithmetic number, because the mean of its divisors is an integer number (4126680).

Almost surely, 2^21703138 is an apocalyptic number.

21703138 is a deficient number, since it is larger than the sum of its proper divisors (11310302).

21703138 is a wasteful number, since it uses less digits than its factorization.

21703138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152912.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21703138 is about 4658.6626836465. The cubic root of 21703138 is about 278.9378895070.

The spelling of 21703138 in words is "twenty-one million, seven hundred three thousand, one hundred thirty-eight".