21448535 has 16 divisors (see below), whose sum is σ = 27518400. Its totient is φ = 16008960.

The previous prime is 21448523. The next prime is 21448561. The reversal of 21448535 is 53584412.

It is not a de Polignac number, because 21448535 - 2⁴ = 21448519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2441 + ... + 6989.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^21448535 is an apocalyptic number.

21448535 is a deficient number, since it is larger than the sum of its proper divisors (6069865).

21448535 is a wasteful number, since it uses less digits than its factorization.

21448535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618.

The product of its digits is 19200, while the sum is 32.

The square root of 21448535 is about 4631.2563090375. The cubic root of 21448535 is about 277.8428411443.

The spelling of 21448535 in words is "twenty-one million, four hundred forty-eight thousand, five hundred thirty-five".