221220334210061 has 2 divisors, whose sum is σ = 221220334210062. Its totient is φ = 221220334210060.

The previous prime is 221220334209989. The next prime is 221220334210091. The reversal of 221220334210061 is 160012433022122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218666311516900 + 2554022693161 = 14787370^2 + 1598131^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220334210061 - 2³⁴ = 221203154340877 is a prime.

It is a super-2 number, since 2×221220334210061² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220334210091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610167105030 + 110610167105031.

It is an arithmetic number, because the mean of its divisors is an integer number (110610167105031).

Almost surely, 2^{221220334210061} is an apocalyptic number.

It is an amenable number.

221220334210061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220334210061 is an equidigital number, since it uses as much as digits as its factorization.

221220334210061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 221220334210061 its reverse (160012433022122), we get a palindrome (381232767232183).

The spelling of 221220334210061 in words is "two hundred twenty-one trillion, two hundred twenty billion, three hundred thirty-four million, two hundred ten thousand, sixty-one".