1022221021421 has 2 divisors, whose sum is σ = 1022221021422. Its totient is φ = 1022221021420.

The previous prime is 1022221021417. The next prime is 1022221021453. The reversal of 1022221021421 is 1241201222201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984044160100 + 38176861321 = 991990^2 + 195389^2 .

It is an emirp because it is prime and its reverse (1241201222201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1022221021421 - 2² = 1022221021417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1022221021393 and 1022221021402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022221021411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511110510710 + 511110510711.

It is an arithmetic number, because the mean of its divisors is an integer number (511110510711).

Almost surely, 2^{1022221021421} is an apocalyptic number.

It is an amenable number.

1022221021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022221021421 is an equidigital number, since it uses as much as digits as its factorization.

1022221021421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1022221021421 its reverse (1241201222201), we get a palindrome (2263422243622).

The spelling of 1022221021421 in words is "one trillion, twenty-two billion, two hundred twenty-one million, twenty-one thousand, four hundred twenty-one".