21276153 has 6 divisors (see below), whose sum is σ = 30732234. Its totient is φ = 14184096.

The previous prime is 21276149. The next prime is 21276179. The reversal of 21276153 is 35167212.

It is a happy number.

21276153 is a `hidden beast` number, since 21 + 27 + 615 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16064064 + 5212089 = 4008^2 + 2283^2 .

It is not a de Polignac number, because 21276153 - 2² = 21276149 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21276113) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1182000 + ... + 1182017.

It is an arithmetic number, because the mean of its divisors is an integer number (5122039).

Almost surely, 2^21276153 is an apocalyptic number.

It is an amenable number.

21276153 is a deficient number, since it is larger than the sum of its proper divisors (9456081).

21276153 is a wasteful number, since it uses less digits than its factorization.

21276153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364023 (or 2364020 counting only the distinct ones).

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

The square root of 21276153 is about 4612.6080475150. The cubic root of 21276153 is about 277.0964965926.

The spelling of 21276153 in words is "twenty-one million, two hundred seventy-six thousand, one hundred fifty-three".