1253121011 has 2 divisors, whose sum is σ = 1253121012. Its totient is φ = 1253121010.

The previous prime is 1253120951. The next prime is 1253121019. The reversal of 1253121011 is 1101213521.

It is a strong prime.

It is an emirp because it is prime and its reverse (1101213521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1253121011 - 2¹⁴ = 1253104627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1253121019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626560505 + 626560506.

It is an arithmetic number, because the mean of its divisors is an integer number (626560506).

Almost surely, 2^1253121011 is an apocalyptic number.

1253121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253121011 is an equidigital number, since it uses as much as digits as its factorization.

1253121011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1253121011 is about 35399.4493036262. The cubic root of 1253121011 is about 1078.1131351390.

Adding to 1253121011 its reverse (1101213521), we get a palindrome (2354334532).

The spelling of 1253121011 in words is "one billion, two hundred fifty-three million, one hundred twenty-one thousand, eleven".