21774202641 has 6 divisors (see below), whose sum is σ = 31451626050. Its totient is φ = 14516135088.

The previous prime is 21774202613. The next prime is 21774202687. The reversal of 21774202641 is 14620247712.

21774202641 is a `hidden beast` number, since 2 + 1 + 7 + 7 + 4 + 2 + 0 + 2 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17977178241 + 3797024400 = 134079^2 + 61620^2 .

It is not a de Polignac number, because 21774202641 - 2⁵ = 21774202609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21774202596 and 21774202605.

It is not an unprimeable number, because it can be changed into a prime (21774202691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1209677916 + ... + 1209677933.

It is an arithmetic number, because the mean of its divisors is an integer number (5241937675).

Almost surely, 2^21774202641 is an apocalyptic number.

It is an amenable number.

21774202641 is a deficient number, since it is larger than the sum of its proper divisors (9677423409).

21774202641 is a wasteful number, since it uses less digits than its factorization.

21774202641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419355855 (or 2419355852 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 21774202641 in words is "twenty-one billion, seven hundred seventy-four million, two hundred two thousand, six hundred forty-one".