100211000117981 has 2 divisors, whose sum is σ = 100211000117982. Its totient is φ = 100211000117980.

The previous prime is 100211000117959. The next prime is 100211000117989. The reversal of 100211000117981 is 189711000112001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89524410286756 + 10686589831225 = 9461734^2 + 3269035^2 .

It is a cyclic number.

It is not a de Polignac number, because 100211000117981 - 2¹⁰ = 100211000116957 is a prime.

It is a super-2 number, since 2×100211000117981² (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 (100211000117989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105500058990 + 50105500058991.

It is an arithmetic number, because the mean of its divisors is an integer number (50105500058991).

Almost surely, 2^{100211000117981} is an apocalyptic number.

It is an amenable number.

100211000117981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100211000117981 is an equidigital number, since it uses as much as digits as its factorization.

100211000117981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 32.

Adding to 100211000117981 its reverse (189711000112001), we get a palindrome (289922000229982).

The spelling of 100211000117981 in words is "one hundred trillion, two hundred eleven billion, one hundred seventeen thousand, nine hundred eighty-one".