21701138 has 8 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 10810260.

The previous prime is 21701123. The next prime is 21701153. The reversal of 21701138 is 83110712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21701123) and next prime (21701153).

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, 19478 + ... + 20561.

It is an arithmetic number, because the mean of its divisors is an integer number (4084080).

Almost surely, 2^21701138 is an apocalyptic number.

21701138 is a deficient number, since it is larger than the sum of its proper divisors (10971502).

21701138 is a wasteful number, since it uses less digits than its factorization.

21701138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40312.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 21701138 is about 4658.4480248254. The cubic root of 21701138 is about 278.9293209624.

The spelling of 21701138 in words is "twenty-one million, seven hundred one thousand, one hundred thirty-eight".