21453135 has 32 divisors (see below), whose sum is σ = 39080448. Its totient is φ = 9947520.

The previous prime is 21453119. The next prime is 21453143. The reversal of 21453135 is 53135412.

It is not a de Polignac number, because 21453135 - 2⁴ = 21453119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 969 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (1221264).

Almost surely, 2^21453135 is an apocalyptic number.

21453135 is a deficient number, since it is larger than the sum of its proper divisors (17627313).

21453135 is a wasteful number, since it uses less digits than its factorization.

21453135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695.

The product of its digits is 1800, while the sum is 24.

The square root of 21453135 is about 4631.7529079173. The cubic root of 21453135 is about 277.8627024186.

Adding to 21453135 its reverse (53135412), we get a palindrome (74588547).

The spelling of 21453135 in words is "twenty-one million, four hundred fifty-three thousand, one hundred thirty-five".