11211102019981 has 2 divisors, whose sum is σ = 11211102019982. Its totient is φ = 11211102019980.

The previous prime is 11211102019973. The next prime is 11211102020009. The reversal of 11211102019981 is 18991020111211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10359064102500 + 852037917481 = 3218550^2 + 923059^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211102019981 - 2³ = 11211102019973 is a prime.

It is a super-2 number, since 2×11211102019981² (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 11211102019981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211102019081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605551009990 + 5605551009991.

It is an arithmetic number, because the mean of its divisors is an integer number (5605551009991).

Almost surely, 2^{11211102019981} is an apocalyptic number.

It is an amenable number.

11211102019981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211102019981 is an equidigital number, since it uses as much as digits as its factorization.

11211102019981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 37.

The spelling of 11211102019981 in words is "eleven trillion, two hundred eleven billion, one hundred two million, nineteen thousand, nine hundred eighty-one".