222221122010621 has 2 divisors, whose sum is σ = 222221122010622. Its totient is φ = 222221122010620.

The previous prime is 222221122010617. The next prime is 222221122010647. The reversal of 222221122010621 is 126010221122222.

It is an a-pointer prime, because the next prime (222221122010647) can be obtained adding 222221122010621 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129807603902596 + 92413518108025 = 11393314^2 + 9613195^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221122010621 - 2² = 222221122010617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222221122010651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110561005310 + 111110561005311.

It is an arithmetic number, because the mean of its divisors is an integer number (111110561005311).

Almost surely, 2^{222221122010621} is an apocalyptic number.

It is an amenable number.

222221122010621 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221122010621 is an equidigital number, since it uses as much as digits as its factorization.

222221122010621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 222221122010621 its reverse (126010221122222), we get a palindrome (348231343132843).

The spelling of 222221122010621 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred twenty-two million, ten thousand, six hundred twenty-one".