21872941 has 8 divisors (see below), whose sum is σ = 22374144. Its totient is φ = 21375120.

The previous prime is 21872923. The next prime is 21872947. The reversal of 21872941 is 14927812.

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 21872941 - 2⁹ = 21872429 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21872897 and 21872906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872947) 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, 15820 + ... + 17146.

It is an arithmetic number, because the mean of its divisors is an integer number (2796768).

Almost surely, 2^21872941 is an apocalyptic number.

It is an amenable number.

21872941 is a deficient number, since it is larger than the sum of its proper divisors (501203).

21872941 is a wasteful number, since it uses less digits than its factorization.

21872941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its digits is 8064, while the sum is 34.

The square root of 21872941 is about 4676.8516119287. The cubic root of 21872941 is about 279.6634604620.

The spelling of 21872941 in words is "twenty-one million, eight hundred seventy-two thousand, nine hundred forty-one".