21861802 has 8 divisors (see below), whose sum is σ = 33555456. Its totient is φ = 10676652.

The previous prime is 21861797. The next prime is 21861809. The reversal of 21861802 is 20816812.

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 (21861809) 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, 127018 + ... + 127189.

It is an arithmetic number, because the mean of its divisors is an integer number (4194432).

Almost surely, 2^21861802 is an apocalyptic number.

21861802 is a deficient number, since it is larger than the sum of its proper divisors (11693654).

21861802 is a wasteful number, since it uses less digits than its factorization.

21861802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254252.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 21861802 is about 4675.6605950390. The cubic root of 21861802 is about 279.6159786557.

The spelling of 21861802 in words is "twenty-one million, eight hundred sixty-one thousand, eight hundred two".