1011211111 has 8 divisors (see below), whose sum is σ = 1032555744. Its totient is φ = 990069120.

The previous prime is 1011211079. The next prime is 1011211127. The reversal of 1011211111 is 1111121101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011211111 - 2⁵ = 1011211079 is a prime.

It is a super-2 number, since 2×1011211111² = 2045095822019708642, which contains 22 as substring.

It is a Duffinian number.

1011211111 is a modest number, since divided by 11111 gives 10112 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40555 + ... + 60556.

It is an arithmetic number, because the mean of its divisors is an integer number (129069468).

Almost surely, 2^1011211111 is an apocalyptic number.

1011211111 is a deficient number, since it is larger than the sum of its proper divisors (21344633).

1011211111 is a wasteful number, since it uses less digits than its factorization.

1011211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101321.

The product of its (nonzero) digits is 2, while the sum is 10.

The square root of 1011211111 is about 31799.5457671961. The cubic root of 1011211111 is about 1003.7231578920.

Adding to 1011211111 its reverse (1111121101), we get a palindrome (2122332212).

The spelling of 1011211111 in words is "one billion, eleven million, two hundred eleven thousand, one hundred eleven".