21963946 has 24 divisors (see below), whose sum is σ = 34735680. Its totient is φ = 10410720.

The previous prime is 21963917. The next prime is 21963947. The reversal of 21963946 is 64936912.

It is a junction number, because it is equal to n+sod(n) for n = 21963899 and 21963908.

It is not an unprimeable number, because it can be changed into a prime (21963947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157945 + ... + 158083.

It is an arithmetic number, because the mean of its divisors is an integer number (1447320).

Almost surely, 2^21963946 is an apocalyptic number.

21963946 is a deficient number, since it is larger than the sum of its proper divisors (12771734).

21963946 is a wasteful number, since it uses less digits than its factorization.

21963946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 229 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 21963946 is about 4686.5708145722. The cubic root of 21963946 is about 280.0507816059.

The spelling of 21963946 in words is "twenty-one million, nine hundred sixty-three thousand, nine hundred forty-six".