100100222011981 has 2 divisors, whose sum is σ = 100100222011982. Its totient is φ = 100100222011980.

The previous prime is 100100222011969. The next prime is 100100222012003. The reversal of 100100222011981 is 189110222001001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67474888776100 + 32625333235881 = 8214310^2 + 5711859^2 .

It is a cyclic number.

It is not a de Polignac number, because 100100222011981 - 2²⁹ = 100099685141069 is a prime.

It is a super-2 number, since 2×100100222011981² (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 (100100222011681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050111005990 + 50050111005991.

It is an arithmetic number, because the mean of its divisors is an integer number (50050111005991).

Almost surely, 2^{100100222011981} is an apocalyptic number.

It is an amenable number.

100100222011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100100222011981 is an equidigital number, since it uses as much as digits as its factorization.

100100222011981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

Adding to 100100222011981 its reverse (189110222001001), we get a palindrome (289210444012982).

The spelling of 100100222011981 in words is "one hundred trillion, one hundred billion, two hundred twenty-two million, eleven thousand, nine hundred eighty-one".