21875053 has 4 divisors (see below), whose sum is σ = 21997440. Its totient is φ = 21752668.

The previous prime is 21875041. The next prime is 21875071. The reversal of 21875053 is 35057812.

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 not a de Polignac number, because 21875053 - 2¹³ = 21866861 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875033) 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, 60925 + ... + 61282.

It is an arithmetic number, because the mean of its divisors is an integer number (5499360).

Almost surely, 2^21875053 is an apocalyptic number.

It is an amenable number.

21875053 is a deficient number, since it is larger than the sum of its proper divisors (122387).

21875053 is a wasteful number, since it uses less digits than its factorization.

21875053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122386.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 21875053 is about 4677.0773994023. The cubic root of 21875053 is about 279.6724613888.

The spelling of 21875053 in words is "twenty-one million, eight hundred seventy-five thousand, fifty-three".