1011013121 has 2 divisors, whose sum is σ = 1011013122. Its totient is φ = 1011013120.

The previous prime is 1011013117. The next prime is 1011013151. The reversal of 1011013121 is 1213101101.

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., 643332496 + 367680625 = 25364^2 + 19175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011013121 - 2² = 1011013117 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011013111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505506560 + 505506561.

It is an arithmetic number, because the mean of its divisors is an integer number (505506561).

Almost surely, 2^1011013121 is an apocalyptic number.

It is an amenable number.

1011013121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011013121 is an equidigital number, since it uses as much as digits as its factorization.

1011013121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1011013121 is about 31796.4325200171. The cubic root of 1011013121 is about 1003.6576456505.

Adding to 1011013121 its reverse (1213101101), we get a palindrome (2224114222).

The spelling of 1011013121 in words is "one billion, eleven million, thirteen thousand, one hundred twenty-one".