221321204101 has 2 divisors, whose sum is σ = 221321204102. Its totient is φ = 221321204100.

The previous prime is 221321204089. The next prime is 221321204107. The reversal of 221321204101 is 101402123122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220890600100 + 430604001 = 469990^2 + 20751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221321204101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221321204107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660602050 + 110660602051.

It is an arithmetic number, because the mean of its divisors is an integer number (110660602051).

Almost surely, 2^221321204101 is an apocalyptic number.

It is an amenable number.

221321204101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321204101 is an equidigital number, since it uses as much as digits as its factorization.

221321204101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221321204101 its reverse (101402123122), we get a palindrome (322723327223).

The spelling of 221321204101 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred four thousand, one hundred one".