1022221312381 has 2 divisors, whose sum is σ = 1022221312382. Its totient is φ = 1022221312380.

The previous prime is 1022221312313. The next prime is 1022221312391. The reversal of 1022221312381 is 1832131222201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 968876019225 + 53345293156 = 984315^2 + 230966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022221312381 - 2⁹ = 1022221311869 is a prime.

It is a super-2 number, since 2×1022221312381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022221312391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511110656190 + 511110656191.

It is an arithmetic number, because the mean of its divisors is an integer number (511110656191).

Almost surely, 2^{1022221312381} is an apocalyptic number.

It is an amenable number.

1022221312381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022221312381 is an equidigital number, since it uses as much as digits as its factorization.

1022221312381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 1022221312381 its reverse (1832131222201), we get a palindrome (2854352534582).

The spelling of 1022221312381 in words is "one trillion, twenty-two billion, two hundred twenty-one million, three hundred twelve thousand, three hundred eighty-one".