21746152 has 8 divisors (see below), whose sum is σ = 40774050. Its totient is φ = 10873072.

The previous prime is 21746149. The next prime is 21746177. The reversal of 21746152 is 25164712.

It can be written as a sum of positive squares in only one way, i.e., 21659716 + 86436 = 4654^2 + 294^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21746152.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1359127 + ... + 1359142.

Almost surely, 2^21746152 is an apocalyptic number.

It is an amenable number.

21746152 is a deficient number, since it is larger than the sum of its proper divisors (19027898).

21746152 is a wasteful number, since it uses less digits than its factorization.

21746152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718275 (or 2718271 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21746152 is about 4663.2769593924. The cubic root of 21746152 is about 279.1220459265.

The spelling of 21746152 in words is "twenty-one million, seven hundred forty-six thousand, one hundred fifty-two".