21100223011081 has 2 divisors, whose sum is σ = 21100223011082. Its totient is φ = 21100223011080.

The previous prime is 21100223011073. The next prime is 21100223011139. The reversal of 21100223011081 is 18011032200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20593398620025 + 506824391056 = 4537995^2 + 711916^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100223011081 - 2³ = 21100223011073 is a prime.

It is a super-3 number, since 3×21100223011081³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21100223011061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550111505540 + 10550111505541.

It is an arithmetic number, because the mean of its divisors is an integer number (10550111505541).

Almost surely, 2^{21100223011081} is an apocalyptic number.

It is an amenable number.

21100223011081 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100223011081 is an equidigital number, since it uses as much as digits as its factorization.

21100223011081 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 21100223011081 its reverse (18011032200112), we get a palindrome (39111255211193).

The spelling of 21100223011081 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, eleven thousand, eighty-one".