21862066 has 8 divisors (see below), whose sum is σ = 33043824. Its totient is φ = 10847460.

The previous prime is 21862063. The next prime is 21862069. The reversal of 21862066 is 66026812.

It is an interprime number because it is at equal distance from previous prime (21862063) and next prime (21862069).

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 (21862063) 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 3 ways as a sum of consecutive naturals, for example, 41460 + ... + 41983.

It is an arithmetic number, because the mean of its divisors is an integer number (4130478).

Almost surely, 2^21862066 is an apocalyptic number.

21862066 is a deficient number, since it is larger than the sum of its proper divisors (11181758).

21862066 is a wasteful number, since it uses less digits than its factorization.

21862066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83576.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21862066 is about 4675.6888262587. The cubic root of 21862066 is about 279.6171041854.

Adding to 21862066 its reverse (66026812), we get a palindrome (87888878).

The spelling of 21862066 in words is "twenty-one million, eight hundred sixty-two thousand, sixty-six".