101222221081 has 2 divisors, whose sum is σ = 101222221082. Its totient is φ = 101222221080.

The previous prime is 101222221069. The next prime is 101222221201. The reversal of 101222221081 is 180122222101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60774575625 + 40447645456 = 246525^2 + 201116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101222221081 is a prime.

It is a super-2 number, since 2×101222221081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101222221781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50611110540 + 50611110541.

It is an arithmetic number, because the mean of its divisors is an integer number (50611110541).

Almost surely, 2^101222221081 is an apocalyptic number.

It is an amenable number.

101222221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

101222221081 is an equidigital number, since it uses as much as digits as its factorization.

101222221081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 101222221081 its reverse (180122222101), we get a palindrome (281344443182).

The spelling of 101222221081 in words is "one hundred one billion, two hundred twenty-two million, two hundred twenty-one thousand, eighty-one".