21875713 has 2 divisors, whose sum is σ = 21875714. Its totient is φ = 21875712.

The previous prime is 21875699. The next prime is 21875747. The reversal of 21875713 is 31757812.

It is an a-pointer prime, because the next prime (21875747) can be obtained adding 21875713 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 1912689 = 4468^2 + 1383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21875713 is a prime.

It is not a weakly prime, because it can be changed into another prime (21870713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937856 + 10937857.

It is an arithmetic number, because the mean of its divisors is an integer number (10937857).

Almost surely, 2^21875713 is an apocalyptic number.

It is an amenable number.

21875713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21875713 is an equidigital number, since it uses as much as digits as its factorization.

21875713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 21875713 is about 4677.1479557525. The cubic root of 21875713 is about 279.6752740596.

The spelling of 21875713 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred thirteen".