21125053 has 8 divisors (see below), whose sum is σ = 21432320. Its totient is φ = 20820240.

The previous prime is 21125029. The next prime is 21125057. The reversal of 21125053 is 35052112.

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

It is a cyclic number.

It is not a de Polignac number, because 21125053 - 2⁹ = 21124541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21125053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22528 + ... + 23446.

It is an arithmetic number, because the mean of its divisors is an integer number (2679040).

Almost surely, 2^21125053 is an apocalyptic number.

It is an amenable number.

21125053 is a deficient number, since it is larger than the sum of its proper divisors (307267).

21125053 is a wasteful number, since it uses less digits than its factorization.

21125053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21125053 is about 4596.1998433489. The cubic root of 21125053 is about 276.4389718672.

Adding to 21125053 its reverse (35052112), we get a palindrome (56177165).

The spelling of 21125053 in words is "twenty-one million, one hundred twenty-five thousand, fifty-three".