21925741 has 2 divisors, whose sum is σ = 21925742. Its totient is φ = 21925740.

The previous prime is 21925697. The next prime is 21925747. The reversal of 21925741 is 14752912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19272100 + 2653641 = 4390^2 + 1629^2 .

It is a cyclic number.

It is not a de Polignac number, because 21925741 - 2⁷ = 21925613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21925747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962870 + 10962871.

It is an arithmetic number, because the mean of its divisors is an integer number (10962871).

Almost surely, 2^21925741 is an apocalyptic number.

It is an amenable number.

21925741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21925741 is an equidigital number, since it uses as much as digits as its factorization.

21925741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 21925741 is about 4682.4930325629. The cubic root of 21925741 is about 279.8883100455. Note that the first 3 decimals are identical.

The spelling of 21925741 in words is "twenty-one million, nine hundred twenty-five thousand, seven hundred forty-one".