21253167 has 24 divisors (see below), whose sum is σ = 33217184. Its totient is φ = 13017024.

The previous prime is 21253121. The next prime is 21253181. The reversal of 21253167 is 76135212.

It is a happy number.

It is not a de Polignac number, because 21253167 - 2⁶ = 21253103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21253167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253117) 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 23 ways as a sum of consecutive naturals, for example, 43398 + ... + 43884.

Almost surely, 2^21253167 is an apocalyptic number.

21253167 is a deficient number, since it is larger than the sum of its proper divisors (11964017).

21253167 is a wasteful number, since it uses less digits than its factorization.

21253167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 876 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21253167 is about 4610.1157252286. The cubic root of 21253167 is about 276.9966722308.

Adding to 21253167 its reverse (76135212), we get a palindrome (97388379).

The spelling of 21253167 in words is "twenty-one million, two hundred fifty-three thousand, one hundred sixty-seven".