10101010100921 has 2 divisors, whose sum is σ = 10101010100922. Its totient is φ = 10101010100920.

The previous prime is 10101010100917. The next prime is 10101010100927. The reversal of 10101010100921 is 12900101010101.

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., 6267387075625 + 3833623025296 = 2503475^2 + 1957964^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101010100921 - 2² = 10101010100917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10101010100921.

It is not a weakly prime, because it can be changed into another prime (10101010100927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050505050460 + 5050505050461.

It is an arithmetic number, because the mean of its divisors is an integer number (5050505050461).

Almost surely, 2^{10101010100921} is an apocalyptic number.

It is an amenable number.

10101010100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101010100921 is an equidigital number, since it uses as much as digits as its factorization.

10101010100921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 17.

The spelling of 10101010100921 in words is "ten trillion, one hundred one billion, ten million, one hundred thousand, nine hundred twenty-one".