21875741 has 4 divisors (see below), whose sum is σ = 22010112. Its totient is φ = 21741372.

The previous prime is 21875713. The next prime is 21875747. The reversal of 21875741 is 14757812.

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-21875741 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 (21875747) 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 3 ways as a sum of consecutive naturals, for example, 66941 + ... + 67266.

It is an arithmetic number, because the mean of its divisors is an integer number (5502528).

Almost surely, 2^21875741 is an apocalyptic number.

It is an amenable number.

21875741 is a deficient number, since it is larger than the sum of its proper divisors (134371).

21875741 is a wasteful number, since it uses less digits than its factorization.

21875741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134370.

The product of its digits is 15680, while the sum is 35.

The square root of 21875741 is about 4677.1509490287. The cubic root of 21875741 is about 279.6753933838.

The spelling of 21875741 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred forty-one".