21965241 has 8 divisors (see below), whose sum is σ = 31009824. Its totient is φ = 13782080.

The previous prime is 21965233. The next prime is 21965243. The reversal of 21965241 is 14256912.

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 21965241 - 2³ = 21965233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21965199 and 21965208.

It is not an unprimeable number, because it can be changed into a prime (21965243) 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, 215295 + ... + 215396.

It is an arithmetic number, because the mean of its divisors is an integer number (3876228).

Almost surely, 2^21965241 is an apocalyptic number.

It is an amenable number.

21965241 is a deficient number, since it is larger than the sum of its proper divisors (9044583).

21965241 is a wasteful number, since it uses less digits than its factorization.

21965241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430711.

The product of its digits is 4320, while the sum is 30.

The square root of 21965241 is about 4686.7089732562. The cubic root of 21965241 is about 280.0562854535.

The spelling of 21965241 in words is "twenty-one million, nine hundred sixty-five thousand, two hundred forty-one".