21372352 has 28 divisors (see below), whose sum is σ = 42565320. Its totient is φ = 10647296.

The previous prime is 21372343. The next prime is 21372353. The reversal of 21372352 is 25327312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372353) 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, 26418 + ... + 27214.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^21372352 is an apocalyptic number.

It is an amenable number.

21372352 is a deficient number, since it is larger than the sum of its proper divisors (21192968).

21372352 is an equidigital number, since it uses as much as digits as its factorization.

21372352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228 (or 1218 counting only the distinct ones).

The product of its digits is 2520, while the sum is 25.

The square root of 21372352 is about 4623.0241184748. The cubic root of 21372352 is about 277.5134944605.

Adding to 21372352 its reverse (25327312), we get a palindrome (46699664).

It can be divided in two parts, 2137 and 2352, that added together give a square (4489 = 67²).

The spelling of 21372352 in words is "twenty-one million, three hundred seventy-two thousand, three hundred fifty-two".