21861707 has 8 divisors (see below), whose sum is σ = 26071296. Its totient is φ = 17923752.

The previous prime is 21861701. The next prime is 21861713. The reversal of 21861707 is 70716812.

It is an interprime number because it is at equal distance from previous prime (21861701) and next prime (21861713).

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

It is not a de Polignac number, because 21861707 - 2⁸ = 21861451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21861701) 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, 67733 + ... + 68054.

It is an arithmetic number, because the mean of its divisors is an integer number (3258912).

Almost surely, 2^21861707 is an apocalyptic number.

21861707 is a deficient number, since it is larger than the sum of its proper divisors (4209589).

21861707 is a wasteful number, since it uses less digits than its factorization.

21861707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135817.

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

The square root of 21861707 is about 4675.6504360356. The cubic root of 21861707 is about 279.6155736333.

The spelling of 21861707 in words is "twenty-one million, eight hundred sixty-one thousand, seven hundred seven".