21254036 has 12 divisors (see below), whose sum is σ = 37563540. Its totient is φ = 10521600.

The previous prime is 21254033. The next prime is 21254039. The reversal of 21254036 is 63045212.

It is an interprime number because it is at equal distance from previous prime (21254033) and next prime (21254039).

It can be written as a sum of positive squares in 2 ways, for example, as 20340100 + 913936 = 4510^2 + 956^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254033) 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 3 ways as a sum of consecutive naturals, for example, 25901 + ... + 26708.

It is an arithmetic number, because the mean of its divisors is an integer number (3130295).

Almost surely, 2^21254036 is an apocalyptic number.

It is an amenable number.

21254036 is a deficient number, since it is larger than the sum of its proper divisors (16309504).

21254036 is a wasteful number, since it uses less digits than its factorization.

21254036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52714 (or 52712 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21254036 is about 4610.2099735262. The cubic root of 21254036 is about 277.0004474616. Note that the first 3 decimals are identical.

Adding to 21254036 its reverse (63045212), we get a palindrome (84299248).

The spelling of 21254036 in words is "twenty-one million, two hundred fifty-four thousand, thirty-six".