100211222981 has 4 divisors (see below), whose sum is σ = 100373640492. Its totient is φ = 100048805472.

The previous prime is 100211222959. The next prime is 100211223017. The reversal of 100211222981 is 189222112001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5485772356 + 94725450625 = 74066^2 + 307775^2 .

It is a cyclic number.

It is not a de Polignac number, because 100211222981 - 2²⁶ = 100144114117 is a prime.

It is a super-2 number, since 2×100211222981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211222381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81207830 + ... + 81209063.

It is an arithmetic number, because the mean of its divisors is an integer number (25093410123).

Almost surely, 2^100211222981 is an apocalyptic number.

It is an amenable number.

100211222981 is a deficient number, since it is larger than the sum of its proper divisors (162417511).

100211222981 is an equidigital number, since it uses as much as digits as its factorization.

100211222981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162417510.

The product of its (nonzero) digits is 1152, while the sum is 29.

Adding to 100211222981 its reverse (189222112001), we get a palindrome (289433334982).

The spelling of 100211222981 in words is "one hundred billion, two hundred eleven million, two hundred twenty-two thousand, nine hundred eighty-one".