2101222021973 has 2 divisors, whose sum is σ = 2101222021974. Its totient is φ = 2101222021972.

The previous prime is 2101222021903. The next prime is 2101222022033. The reversal of 2101222021973 is 3791202221012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1898007693124 + 203214328849 = 1377682^2 + 450793^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101222021973 - 2¹² = 2101222017877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101222021903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050611010986 + 1050611010987.

It is an arithmetic number, because the mean of its divisors is an integer number (1050611010987).

Almost surely, 2^{2101222021973} is an apocalyptic number.

It is an amenable number.

2101222021973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101222021973 is an equidigital number, since it uses as much as digits as its factorization.

2101222021973 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 32.

Adding to 2101222021973 its reverse (3791202221012), we get a palindrome (5892424242985).

The spelling of 2101222021973 in words is "two trillion, one hundred one billion, two hundred twenty-two million, twenty-one thousand, nine hundred seventy-three".