1111212121011 has 16 divisors (see below), whose sum is σ = 1568794306464. Its totient is φ = 697220355584.

The previous prime is 1111212121003. The next prime is 1111212121013. The reversal of 1111212121011 is 1101212121111.

It is a cyclic number.

It is not a de Polignac number, because 1111212121011 - 2³ = 1111212121003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111212121013) 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, 4328401 + ... + 4577933.

It is an arithmetic number, because the mean of its divisors is an integer number (98049644154).

Almost surely, 2^{1111212121011} is an apocalyptic number.

1111212121011 is a deficient number, since it is larger than the sum of its proper divisors (457582185453).

1111212121011 is a wasteful number, since it uses less digits than its factorization.

1111212121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336870.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1111212121011 its reverse (1101212121111), we get a palindrome (2212424242122).

The spelling of 1111212121011 in words is "one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, eleven".