21701867 has 8 divisors (see below), whose sum is σ = 23746800. Its totient is φ = 19668960.

The previous prime is 21701839. The next prime is 21701873. The reversal of 21701867 is 76810712.

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

It is a cyclic number.

It is not a de Polignac number, because 21701867 - 2⁶ = 21701803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21701807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (2968350).

Almost surely, 2^21701867 is an apocalyptic number.

21701867 is a deficient number, since it is larger than the sum of its proper divisors (2044933).

21701867 is a wasteful number, since it uses less digits than its factorization.

21701867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6013.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 21701867 is about 4658.5262691113. The cubic root of 21701867 is about 278.9324442578.

The spelling of 21701867 in words is "twenty-one million, seven hundred one thousand, eight hundred sixty-seven".