21452235 has 32 divisors (see below), whose sum is σ = 41295360. Its totient is φ = 9289728.

The previous prime is 21452219. The next prime is 21452237. The reversal of 21452235 is 53225412.

It is not a de Polignac number, because 21452235 - 2⁴ = 21452219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21452237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3382 + ... + 7371.

It is an arithmetic number, because the mean of its divisors is an integer number (1290480).

Almost surely, 2^21452235 is an apocalyptic number.

21452235 is a deficient number, since it is larger than the sum of its proper divisors (19843125).

21452235 is a wasteful number, since it uses less digits than its factorization.

21452235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10787.

The product of its digits is 2400, while the sum is 24.

The square root of 21452235 is about 4631.6557514565. The cubic root of 21452235 is about 277.8588167406.

Adding to 21452235 its reverse (53225412), we get a palindrome (74677647).

The spelling of 21452235 in words is "twenty-one million, four hundred fifty-two thousand, two hundred thirty-five".