21042352 has 20 divisors (see below), whose sum is σ = 40954720. Its totient is φ = 10473408.

The previous prime is 21042347. The next prime is 21042353. The reversal of 21042352 is 25324012.

It is not an unprimeable number, because it can be changed into a prime (21042353) 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, 793 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (2047736).

Almost surely, 2^21042352 is an apocalyptic number.

It is an amenable number.

21042352 is a deficient number, since it is larger than the sum of its proper divisors (19912368).

21042352 is a wasteful number, since it uses less digits than its factorization.

21042352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980 (or 5974 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21042352 is about 4587.1943494908. The cubic root of 21042352 is about 276.0777628674.

Adding to 21042352 its reverse (25324012), we get a palindrome (46366364).

The spelling of 21042352 in words is "twenty-one million, forty-two thousand, three hundred fifty-two".