21131053 has 8 divisors (see below), whose sum is σ = 22125600. Its totient is φ = 20154288.

The previous prime is 21131041. The next prime is 21131069. The reversal of 21131053 is 35013112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21131053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131083) 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 7 ways as a sum of consecutive naturals, for example, 1983 + ... + 6796.

It is an arithmetic number, because the mean of its divisors is an integer number (2765700).

Almost surely, 2^21131053 is an apocalyptic number.

It is an amenable number.

21131053 is a deficient number, since it is larger than the sum of its proper divisors (994547).

21131053 is an equidigital number, since it uses as much as digits as its factorization.

21131053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891.

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

The square root of 21131053 is about 4596.8525101421. The cubic root of 21131053 is about 276.4651410612.

Adding to 21131053 its reverse (35013112), we get a palindrome (56144165).

The spelling of 21131053 in words is "twenty-one million, one hundred thirty-one thousand, fifty-three".