1211201011 has 2 divisors, whose sum is σ = 1211201012. Its totient is φ = 1211201010.

The previous prime is 1211200993. The next prime is 1211201039. The reversal of 1211201011 is 1101021121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211201011 - 2⁹ = 1211200499 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211201041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600505 + 605600506.

It is an arithmetic number, because the mean of its divisors is an integer number (605600506).

Almost surely, 2^1211201011 is an apocalyptic number.

1211201011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211201011 is an equidigital number, since it uses as much as digits as its factorization.

1211201011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1211201011 is about 34802.3132995495. The cubic root of 1211201011 is about 1065.9546821690.

Adding to 1211201011 its reverse (1101021121), we get a palindrome (2312222132).

The spelling of 1211201011 in words is "one billion, two hundred eleven million, two hundred one thousand, eleven".