21802241 has 8 divisors (see below), whose sum is σ = 22176000. Its totient is φ = 21431520.

The previous prime is 21802189. The next prime is 21802243. The reversal of 21802241 is 14220812.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21802241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21802243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17096 + ... + 18326.

It is an arithmetic number, because the mean of its divisors is an integer number (2772000).

Almost surely, 2^21802241 is an apocalyptic number.

It is an amenable number.

21802241 is a deficient number, since it is larger than the sum of its proper divisors (373759).

21802241 is a wasteful number, since it uses less digits than its factorization.

21802241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21802241 is about 4669.2869905372. The cubic root of 21802241 is about 279.3618160962.

The spelling of 21802241 in words is "twenty-one million, eight hundred two thousand, two hundred forty-one".