21140053 has 4 divisors (see below), whose sum is σ = 23061888. Its totient is φ = 19218220.

The previous prime is 21140033. The next prime is 21140069. The reversal of 21140053 is 35004112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140053 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 (21140003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960901 + ... + 960922.

It is an arithmetic number, because the mean of its divisors is an integer number (5765472).

Almost surely, 2^21140053 is an apocalyptic number.

It is an amenable number.

21140053 is a deficient number, since it is larger than the sum of its proper divisors (1921835).

21140053 is a wasteful number, since it uses less digits than its factorization.

21140053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921834.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21140053 is about 4597.8313366195. The cubic root of 21140053 is about 276.5043855655.

Adding to 21140053 its reverse (35004112), we get a palindrome (56144165).

The spelling of 21140053 in words is "twenty-one million, one hundred forty thousand, fifty-three".