1011211221111 has 64 divisors (see below), whose sum is σ = 1708328165376. Its totient is φ = 517735411200.

The previous prime is 1011211221043. The next prime is 1011211221127. The reversal of 1011211221111 is 1111221121101.

It is not a de Polignac number, because 1011211221111 - 2⁹ = 1011211220599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011211221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4133626 + ... + 4371416.

It is an arithmetic number, because the mean of its divisors is an integer number (26692627584).

Almost surely, 2^{1011211221111} is an apocalyptic number.

1011211221111 is a deficient number, since it is larger than the sum of its proper divisors (697116944265).

1011211221111 is a wasteful number, since it uses less digits than its factorization.

1011211221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238272.

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

Adding to 1011211221111 its reverse (1111221121101), we get a palindrome (2122432342212).

The spelling of 1011211221111 in words is "one trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".