21802346 has 4 divisors (see below), whose sum is σ = 32703522. Its totient is φ = 10901172.

The previous prime is 21802337. The next prime is 21802349. The reversal of 21802346 is 64320812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 1651225 = 4489^2 + 1285^2 .

It is a super-2 number, since 2×21802346² = 950684582207432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21802349) 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 as a sum of consecutive naturals, namely, 5450585 + ... + 5450588.

Almost surely, 2^21802346 is an apocalyptic number.

21802346 is a deficient number, since it is larger than the sum of its proper divisors (10901176).

21802346 is a wasteful number, since it uses less digits than its factorization.

21802346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10901175.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21802346 is about 4669.2982342104. The cubic root of 21802346 is about 279.3622645660.

The spelling of 21802346 in words is "twenty-one million, eight hundred two thousand, three hundred forty-six".