10101020009981 has 2 divisors, whose sum is σ = 10101020009982. Its totient is φ = 10101020009980.

The previous prime is 10101020009939. The next prime is 10101020010013. The reversal of 10101020009981 is 18990002010101.

It is an a-pointer prime, because the next prime (10101020010013) can be obtained adding 10101020009981 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7195242936025 + 2905777073956 = 2682395^2 + 1704634^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101020009981 - 2¹⁸ = 10101019747837 is a prime.

It is a super-2 number, since 2×10101020009981² (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 (10101020009911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050510004990 + 5050510004991.

It is an arithmetic number, because the mean of its divisors is an integer number (5050510004991).

Almost surely, 2^{10101020009981} is an apocalyptic number.

It is an amenable number.

10101020009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101020009981 is an equidigital number, since it uses as much as digits as its factorization.

10101020009981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 10101020009981 in words is "ten trillion, one hundred one billion, twenty million, nine thousand, nine hundred eighty-one".