21267152 has 10 divisors (see below), whose sum is σ = 41205138. Its totient is φ = 10633568.

The previous prime is 21267149. The next prime is 21267161. The reversal of 21267152 is 25176212.

It can be written as a sum of positive squares in only one way, i.e., 14318656 + 6948496 = 3784^2 + 2636^2 .

It is a super-2 number, since 2×21267152² = 904583508382208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664583 + ... + 664614.

Almost surely, 2^21267152 is an apocalyptic number.

It is an amenable number.

21267152 is a deficient number, since it is larger than the sum of its proper divisors (19937986).

21267152 is a wasteful number, since it uses less digits than its factorization.

21267152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329205 (or 1329199 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21267152 is about 4611.6322489982. The cubic root of 21267152 is about 277.0574153206.

The spelling of 21267152 in words is "twenty-one million, two hundred sixty-seven thousand, one hundred fifty-two".