1220002111621 has 2 divisors, whose sum is σ = 1220002111622. Its totient is φ = 1220002111620.

The previous prime is 1220002111609. The next prime is 1220002111631. The reversal of 1220002111621 is 1261112000221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614428661025 + 605573450596 = 783855^2 + 778186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220002111621 - 2⁹ = 1220002111109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220002111631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610001055810 + 610001055811.

It is an arithmetic number, because the mean of its divisors is an integer number (610001055811).

Almost surely, 2^{1220002111621} is an apocalyptic number.

It is an amenable number.

1220002111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220002111621 is an equidigital number, since it uses as much as digits as its factorization.

1220002111621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1220002111621 its reverse (1261112000221), we get a palindrome (2481114111842).

The spelling of 1220002111621 in words is "one trillion, two hundred twenty billion, two million, one hundred eleven thousand, six hundred twenty-one".