21902041 has 8 divisors (see below), whose sum is σ = 26348480. Its totient is φ = 17785008.

The previous prime is 21902033. The next prime is 21902051. The reversal of 21902041 is 14020912.

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

It is a cyclic number.

It is not a de Polignac number, because 21902041 - 2³ = 21902033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902051) 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 7 ways as a sum of consecutive naturals, for example, 82206 + ... + 82471.

It is an arithmetic number, because the mean of its divisors is an integer number (3293560).

Almost surely, 2^21902041 is an apocalyptic number.

It is an amenable number.

21902041 is a deficient number, since it is larger than the sum of its proper divisors (4446439).

21902041 is a wasteful number, since it uses less digits than its factorization.

21902041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164703.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21902041 is about 4679.9616451420. The cubic root of 21902041 is about 279.7874279448.

Adding to 21902041 its reverse (14020912), we get a palindrome (35922953).

The spelling of 21902041 in words is "twenty-one million, nine hundred two thousand, forty-one".