21031153 has 16 divisors (see below), whose sum is σ = 25123392. Its totient is φ = 17352000.

The previous prime is 21031151. The next prime is 21031163. The reversal of 21031153 is 35113012.

It is a cyclic number.

It is not a de Polignac number, because 21031153 - 2¹ = 21031151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031151) 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 15 ways as a sum of consecutive naturals, for example, 7518 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (1570212).

Almost surely, 2^21031153 is an apocalyptic number.

It is an amenable number.

21031153 is a deficient number, since it is larger than the sum of its proper divisors (4092239).

21031153 is a wasteful number, since it uses less digits than its factorization.

21031153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21031153 is about 4585.9735062471. The cubic root of 21031153 is about 276.0287768427.

Adding to 21031153 its reverse (35113012), we get a palindrome (56144165).

The spelling of 21031153 in words is "twenty-one million, thirty-one thousand, one hundred fifty-three".