21774601 has 2 divisors, whose sum is σ = 21774602. Its totient is φ = 21774600.

The previous prime is 21774587. The next prime is 21774619. The reversal of 21774601 is 10647712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11048976 + 10725625 = 3324^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 21774601 - 2⁹ = 21774089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21774601.

It is not a weakly prime, because it can be changed into another prime (21774631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887300 + 10887301.

It is an arithmetic number, because the mean of its divisors is an integer number (10887301).

Almost surely, 2^21774601 is an apocalyptic number.

It is an amenable number.

21774601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21774601 is an equidigital number, since it uses as much as digits as its factorization.

21774601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21774601 is about 4666.3262852055. The cubic root of 21774601 is about 279.2437116327.

The spelling of 21774601 in words is "twenty-one million, seven hundred seventy-four thousand, six hundred one".