21222111020977 has 2 divisors, whose sum is σ = 21222111020978. Its totient is φ = 21222111020976.

The previous prime is 21222111020879. The next prime is 21222111021037. The reversal of 21222111020977 is 77902011122212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20705266492416 + 516844528561 = 4550304^2 + 718919^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222111020977 - 2²³ = 21222102632369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222111020177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611055510488 + 10611055510489.

It is an arithmetic number, because the mean of its divisors is an integer number (10611055510489).

Almost surely, 2^{21222111020977} is an apocalyptic number.

It is an amenable number.

21222111020977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222111020977 is an equidigital number, since it uses as much as digits as its factorization.

21222111020977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The spelling of 21222111020977 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty thousand, nine hundred seventy-seven".