221120220100621 has 2 divisors, whose sum is σ = 221120220100622. Its totient is φ = 221120220100620.

The previous prime is 221120220100613. The next prime is 221120220100643. The reversal of 221120220100621 is 126001022021122.

It is an a-pointer prime, because the next prime (221120220100643) can be obtained adding 221120220100621 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214921170836100 + 6199049264521 = 14660190^2 + 2489789^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120220100621 - 2³ = 221120220100613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221120220100592 and 221120220100601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221120220100721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560110050310 + 110560110050311.

It is an arithmetic number, because the mean of its divisors is an integer number (110560110050311).

Almost surely, 2^{221120220100621} is an apocalyptic number.

It is an amenable number.

221120220100621 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120220100621 is an equidigital number, since it uses as much as digits as its factorization.

221120220100621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 221120220100621 its reverse (126001022021122), we get a palindrome (347121242121743).

The spelling of 221120220100621 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twenty million, one hundred thousand, six hundred twenty-one".