21530222767773 has 6 divisors (see below), whose sum is σ = 31099210664574. Its totient is φ = 14353481845176.

The previous prime is 21530222767741. The next prime is 21530222767777. The reversal of 21530222767773 is 37776722203512.

21530222767773 is a `hidden beast` number, since 2 + 1 + 530 + 22 + 27 + 67 + 7 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20443754261529 + 1086468506244 = 4521477^2 + 1042338^2 .

It is not a de Polignac number, because 21530222767773 - 2⁵ = 21530222767741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530222767777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1196123487090 + ... + 1196123487107.

It is an arithmetic number, because the mean of its divisors is an integer number (5183201777429).

Almost surely, 2^{21530222767773} is an apocalyptic number.

It is an amenable number.

21530222767773 is a deficient number, since it is larger than the sum of its proper divisors (9568987896801).

21530222767773 is a wasteful number, since it uses less digits than its factorization.

21530222767773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392246974203 (or 2392246974200 counting only the distinct ones).

The product of its (nonzero) digits is 10372320, while the sum is 54.

The spelling of 21530222767773 in words is "twenty-one trillion, five hundred thirty billion, two hundred twenty-two million, seven hundred sixty-seven thousand, seven hundred seventy-three".