11021011010981 has 2 divisors, whose sum is σ = 11021011010982. Its totient is φ = 11021011010980.

The previous prime is 11021011010953. The next prime is 11021011011047. The reversal of 11021011010981 is 18901011012011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8028920596225 + 2992090414756 = 2833535^2 + 1729766^2 .

It is an emirp because it is prime and its reverse (18901011012011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11021011010981 - 2¹⁴ = 11021010994597 is a prime.

It is a super-2 number, since 2×11021011010981² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11021011010981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021011010941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510505505490 + 5510505505491.

It is an arithmetic number, because the mean of its divisors is an integer number (5510505505491).

Almost surely, 2^{11021011010981} is an apocalyptic number.

It is an amenable number.

11021011010981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021011010981 is an equidigital number, since it uses as much as digits as its factorization.

11021011010981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 26.

Adding to 11021011010981 its reverse (18901011012011), we get a palindrome (29922022022992).

The spelling of 11021011010981 in words is "eleven trillion, twenty-one billion, eleven million, ten thousand, nine hundred eighty-one".