221221101012061 has 2 divisors, whose sum is σ = 221221101012062. Its totient is φ = 221221101012060.

The previous prime is 221221101012013. The next prime is 221221101012083. The reversal of 221221101012061 is 160210101122122.

It is an a-pointer prime, because the next prime (221221101012083) can be obtained adding 221221101012061 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215907200075961 + 5313900936100 = 14693781^2 + 2305190^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221101012061 - 2⁴⁵ = 186036728923229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221101012001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610550506030 + 110610550506031.

It is an arithmetic number, because the mean of its divisors is an integer number (110610550506031).

Almost surely, 2^{221221101012061} is an apocalyptic number.

It is an amenable number.

221221101012061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221101012061 is an equidigital number, since it uses as much as digits as its factorization.

221221101012061 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 22.

Adding to 221221101012061 its reverse (160210101122122), we get a palindrome (381431202134183).

The spelling of 221221101012061 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, twelve thousand, sixty-one".