1211212101011 has 16 divisors (see below), whose sum is σ = 1326492840960. Its totient is φ = 1096796068320.

The previous prime is 1211212100983. The next prime is 1211212101041. The reversal of 1211212101011 is 1101012121121.

It is a cyclic number.

It is not a de Polignac number, because 1211212101011 - 2²⁶ = 1211144992147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211212101041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8311070 + ... + 8455548.

It is an arithmetic number, because the mean of its divisors is an integer number (82905802560).

Almost surely, 2^{1211212101011} is an apocalyptic number.

1211212101011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211212101011 is a deficient number, since it is larger than the sum of its proper divisors (115280739949).

1211212101011 is a wasteful number, since it uses less digits than its factorization.

1211212101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147466.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211212101011 its reverse (1101012121121), we get a palindrome (2312224222132).

The spelling of 1211212101011 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred one thousand, eleven".