21747072223273 has 2 divisors, whose sum is σ = 21747072223274. Its totient is φ = 21747072223272.

The previous prime is 21747072223213. The next prime is 21747072223301. The reversal of 21747072223273 is 37232227074712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11211802650409 + 10535269572864 = 3348403^2 + 3245808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21747072223273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21747072223213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873536111636 + 10873536111637.

It is an arithmetic number, because the mean of its divisors is an integer number (10873536111637).

Almost surely, 2^{21747072223273} is an apocalyptic number.

It is an amenable number.

21747072223273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21747072223273 is an equidigital number, since it uses as much as digits as its factorization.

21747072223273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2765952, while the sum is 49.

Adding to 21747072223273 its reverse (37232227074712), we get a palindrome (58979299297985).

The spelling of 21747072223273 in words is "twenty-one trillion, seven hundred forty-seven billion, seventy-two million, two hundred twenty-three thousand, two hundred seventy-three".