8973221174821 has 2 divisors, whose sum is σ = 8973221174822. Its totient is φ = 8973221174820.

The previous prime is 8973221174779. The next prime is 8973221174839. The reversal of 8973221174821 is 1284711223798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5139402350625 + 3833818824196 = 2267025^2 + 1958014^2 .

It is a cyclic number.

It is not a de Polignac number, because 8973221174821 - 2¹⁷ = 8973221043749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8973221174861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4486610587410 + 4486610587411.

It is an arithmetic number, because the mean of its divisors is an integer number (4486610587411).

Almost surely, 2^{8973221174821} is an apocalyptic number.

It is an amenable number.

8973221174821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8973221174821 is an equidigital number, since it uses as much as digits as its factorization.

8973221174821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 55.

The spelling of 8973221174821 in words is "eight trillion, nine hundred seventy-three billion, two hundred twenty-one million, one hundred seventy-four thousand, eight hundred twenty-one".