20211222111973 has 2 divisors, whose sum is σ = 20211222111974. Its totient is φ = 20211222111972.

The previous prime is 20211222111893. The next prime is 20211222112033. The reversal of 20211222111973 is 37911122211202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20152620353889 + 58601758084 = 4489167^2 + 242078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211222111973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211222112973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105611055986 + 10105611055987.

It is an arithmetic number, because the mean of its divisors is an integer number (10105611055987).

Almost surely, 2^{20211222111973} is an apocalyptic number.

It is an amenable number.

20211222111973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211222111973 is an equidigital number, since it uses as much as digits as its factorization.

20211222111973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 20211222111973 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, nine hundred seventy-three".