10000100099981 has 2 divisors, whose sum is σ = 10000100099982. Its totient is φ = 10000100099980.

The previous prime is 10000100099939. The next prime is 10000100100037. The reversal of 10000100099981 is 18999000100001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9424034279881 + 576065820100 = 3069859^2 + 758990^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000100099981 - 2¹⁸ = 10000099837837 is a prime.

It is a super-2 number, since 2×10000100099981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10000100099081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000050049990 + 5000050049991.

It is an arithmetic number, because the mean of its divisors is an integer number (5000050049991).

Almost surely, 2^{10000100099981} is an apocalyptic number.

It is an amenable number.

10000100099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000100099981 is an equidigital number, since it uses as much as digits as its factorization.

10000100099981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

Adding to 10000100099981 its reverse (18999000100001), we get a palindrome (28999100199982).

The spelling of 10000100099981 in words is "ten trillion, one hundred million, ninety-nine thousand, nine hundred eighty-one".