21492153 has 24 divisors (see below), whose sum is σ = 32135688. Its totient is φ = 13830912.

The previous prime is 21492151. The next prime is 21492157. The reversal of 21492153 is 35129412.

21492153 is a `hidden beast` number, since 21 + 492 + 153 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1671849 + 19820304 = 1293^2 + 4452^2 .

It is not a de Polignac number, because 21492153 - 2¹ = 21492151 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77451 + ... + 77727.

It is an arithmetic number, because the mean of its divisors is an integer number (1338987).

Almost surely, 2^21492153 is an apocalyptic number.

It is an amenable number.

21492153 is a deficient number, since it is larger than the sum of its proper divisors (10643535).

21492153 is a wasteful number, since it uses less digits than its factorization.

21492153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 550 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21492153 is about 4635.9630067549. The cubic root of 21492153 is about 278.0310551371.

The spelling of 21492153 in words is "twenty-one million, four hundred ninety-two thousand, one hundred fifty-three".