102100010981 has 2 divisors, whose sum is σ = 102100010982. Its totient is φ = 102100010980.

The previous prime is 102100010941. The next prime is 102100011113. The reversal of 102100010981 is 189010001201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63287464900 + 38812546081 = 251570^2 + 197009^2 .

It is a cyclic number.

It is not a de Polignac number, because 102100010981 - 2⁶ = 102100010917 is a prime.

It is a super-2 number, since 2×102100010981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102100010911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050005490 + 51050005491.

It is an arithmetic number, because the mean of its divisors is an integer number (51050005491).

Almost surely, 2^102100010981 is an apocalyptic number.

It is an amenable number.

102100010981 is a deficient number, since it is larger than the sum of its proper divisors (1).

102100010981 is an equidigital number, since it uses as much as digits as its factorization.

102100010981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 102100010981 in words is "one hundred two billion, one hundred million, ten thousand, nine hundred eighty-one".