221020019889029 has 2 divisors, whose sum is σ = 221020019889030. Its totient is φ = 221020019889028.

The previous prime is 221020019889023. The next prime is 221020019889049. The reversal of 221020019889029 is 920988910020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189408525680929 + 31611494208100 = 13762577^2 + 5622410^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020019889029 - 2⁴⁰ = 219920508261253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020019889023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510009944514 + 110510009944515.

It is an arithmetic number, because the mean of its divisors is an integer number (110510009944515).

Almost surely, 2^{221020019889029} is an apocalyptic number.

It is an amenable number.

221020019889029 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020019889029 is an equidigital number, since it uses as much as digits as its factorization.

221020019889029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 221020019889029 in words is "two hundred twenty-one trillion, twenty billion, nineteen million, eight hundred eighty-nine thousand, twenty-nine".