1011212220111 has 16 divisors (see below), whose sum is σ = 1385234231808. Its totient is φ = 655679296800.

The previous prime is 1011212220091. The next prime is 1011212220149. The reversal of 1011212220111 is 1110222121101.

It is a happy number.

It is not a de Polignac number, because 1011212220111 - 2⁹ = 1011212219599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011212220191) 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, 1379275 + ... + 1981116.

It is an arithmetic number, because the mean of its divisors is an integer number (86577139488).

Almost surely, 2^{1011212220111} is an apocalyptic number.

1011212220111 is a deficient number, since it is larger than the sum of its proper divisors (374022011697).

1011212220111 is a wasteful number, since it uses less digits than its factorization.

1011212220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363142.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1011212220111 its reverse (1110222121101), we get a palindrome (2121434341212).

It can be divided in two parts, 101121 and 2220111, that added together give a palindrome (2321232).

The spelling of 1011212220111 in words is "one trillion, eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred eleven".