10000121021081 has 2 divisors, whose sum is σ = 10000121021082. Its totient is φ = 10000121021080.

The previous prime is 10000121021053. The next prime is 10000121021131. The reversal of 10000121021081 is 18012012100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5581212526681 + 4418908494400 = 2362459^2 + 2102120^2 .

It is an emirp because it is prime and its reverse (18012012100001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10000121021081 is a prime.

It is a super-2 number, since 2×10000121021081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10000121021881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000060510540 + 5000060510541.

It is an arithmetic number, because the mean of its divisors is an integer number (5000060510541).

Almost surely, 2^{10000121021081} is an apocalyptic number.

It is an amenable number.

10000121021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000121021081 is an equidigital number, since it uses as much as digits as its factorization.

10000121021081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10000121021081 its reverse (18012012100001), we get a palindrome (28012133121082).

The spelling of 10000121021081 in words is "ten trillion, one hundred twenty-one million, twenty-one thousand, eighty-one".