21968452 has 12 divisors (see below), whose sum is σ = 41939856. Its totient is φ = 9985640.

The previous prime is 21968449. The next prime is 21968459. The reversal of 21968452 is 25486912.

It is a super-2 number, since 2×21968452² = 965225766552608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21968459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249598 + ... + 249685.

It is an arithmetic number, because the mean of its divisors is an integer number (3494988).

Almost surely, 2^21968452 is an apocalyptic number.

21968452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21968452 is a deficient number, since it is larger than the sum of its proper divisors (19971404).

21968452 is a wasteful number, since it uses less digits than its factorization.

21968452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499298 (or 499296 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 21968452 is about 4687.0515252128. The cubic root of 21968452 is about 280.0699315124.

It can be divided in two parts, 2196 and 8452, that added together give a cube (10648 = 22³).

The spelling of 21968452 in words is "twenty-one million, nine hundred sixty-eight thousand, four hundred fifty-two".