21954601 has 2 divisors, whose sum is σ = 21954602. Its totient is φ = 21954600.

The previous prime is 21954589. The next prime is 21954607. The reversal of 21954601 is 10645912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 4515625 = 4176^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 21954601 - 2¹³ = 21946409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21954601.

It is not a weakly prime, because it can be changed into another prime (21954607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977300 + 10977301.

It is an arithmetic number, because the mean of its divisors is an integer number (10977301).

Almost surely, 2^21954601 is an apocalyptic number.

It is an amenable number.

21954601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954601 is an equidigital number, since it uses as much as digits as its factorization.

21954601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21954601 is about 4685.5737108704. The cubic root of 21954601 is about 280.0110582367.

The spelling of 21954601 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred one".