21841802 has 4 divisors (see below), whose sum is σ = 32762706. Its totient is φ = 10920900.

The previous prime is 21841751. The next prime is 21841817. The reversal of 21841802 is 20814812.

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., 21446161 + 395641 = 4631^2 + 629^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5460449 + ... + 5460452.

Almost surely, 2^21841802 is an apocalyptic number.

21841802 is a deficient number, since it is larger than the sum of its proper divisors (10920904).

21841802 is a wasteful number, since it uses less digits than its factorization.

21841802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10920903.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21841802 is about 4673.5213704443. The cubic root of 21841802 is about 279.5306848970.

The spelling of 21841802 in words is "twenty-one million, eight hundred forty-one thousand, eight hundred two".