21254835 has 32 divisors (see below), whose sum is σ = 39923712. Its totient is φ = 9452160.

The previous prime is 21254819. The next prime is 21254839. The reversal of 21254835 is 53845212.

It is not a de Polignac number, because 21254835 - 2⁴ = 21254819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21254839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (1247616).

Almost surely, 2^21254835 is an apocalyptic number.

21254835 is a deficient number, since it is larger than the sum of its proper divisors (18668877).

21254835 is a wasteful number, since it uses less digits than its factorization.

21254835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5523.

The product of its digits is 9600, while the sum is 30.

The square root of 21254835 is about 4610.2966282008. The cubic root of 21254835 is about 277.0039184977.

It can be divided in two parts, 21 and 254835, that multiplied together give a palindrome (5351535).

The spelling of 21254835 in words is "twenty-one million, two hundred fifty-four thousand, eight hundred thirty-five".