1012121081 has 2 divisors, whose sum is σ = 1012121082. Its totient is φ = 1012121080.

The previous prime is 1012121069. The next prime is 1012121113. The reversal of 1012121081 is 1801212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986274025 + 25847056 = 31405^2 + 5084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012121081 - 2²⁶ = 945012217 is a prime.

It is a super-2 number, since 2×1012121081² = 2048778165209217122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1012121021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506060540 + 506060541.

It is an arithmetic number, because the mean of its divisors is an integer number (506060541).

Almost surely, 2^1012121081 is an apocalyptic number.

It is an amenable number.

1012121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012121081 is an equidigital number, since it uses as much as digits as its factorization.

1012121081 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.

The square root of 1012121081 is about 31813.8504585660. The cubic root of 1012121081 is about 1004.0241448694.

Adding to 1012121081 its reverse (1801212101), we get a palindrome (2813333182).

The spelling of 1012121081 in words is "one billion, twelve million, one hundred twenty-one thousand, eighty-one".