221020000021241 has 2 divisors, whose sum is σ = 221020000021242. Its totient is φ = 221020000021240.

The previous prime is 221020000021189. The next prime is 221020000021307. The reversal of 221020000021241 is 142120000020122.

221020000021241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205269261582841 + 15750738438400 = 14327221^2 + 3968720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020000021241 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020000051241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510000010620 + 110510000010621.

It is an arithmetic number, because the mean of its divisors is an integer number (110510000010621).

Almost surely, 2^{221020000021241} is an apocalyptic number.

It is an amenable number.

221020000021241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020000021241 is an equidigital number, since it uses as much as digits as its factorization.

221020000021241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221020000021241 its reverse (142120000020122), we get a palindrome (363140000041363).

The spelling of 221020000021241 in words is "two hundred twenty-one trillion, twenty billion, twenty-one thousand, two hundred forty-one".