21435849 has 12 divisors (see below), whose sum is σ = 31962112. Its totient is φ = 13829400.

The previous prime is 21435833. The next prime is 21435853. The reversal of 21435849 is 94853412.

It is not a de Polignac number, because 21435849 - 2⁴ = 21435833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38137 + ... + 38694.

Almost surely, 2^21435849 is an apocalyptic number.

It is an amenable number.

21435849 is a deficient number, since it is larger than the sum of its proper divisors (10526263).

21435849 is a wasteful number, since it uses less digits than its factorization.

21435849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76868 (or 76865 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21435849 is about 4629.8864996887. The cubic root of 21435849 is about 277.7880524851.

It can be divided in two parts, 214 and 35849, that added together give a palindrome (36063).

The spelling of 21435849 in words is "twenty-one million, four hundred thirty-five thousand, eight hundred forty-nine".