1021312111 has 32 divisors (see below), whose sum is σ = 1189728000. Its totient is φ = 870170112.

The previous prime is 1021312087. The next prime is 1021312129. The reversal of 1021312111 is 1112131201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1021312111 - 2⁷ = 1021311983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021312091 and 1021312100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021312141) 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 31 ways as a sum of consecutive naturals, for example, 1001760 + ... + 1002778.

It is an arithmetic number, because the mean of its divisors is an integer number (37179000).

Almost surely, 2^1021312111 is an apocalyptic number.

1021312111 is a deficient number, since it is larger than the sum of its proper divisors (168415889).

1021312111 is a wasteful number, since it uses less digits than its factorization.

1021312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1021312111 is about 31957.9741379206. The cubic root of 1021312111 is about 1007.0541588354.

Adding to 1021312111 its reverse (1112131201), we get a palindrome (2133443312).

The spelling of 1021312111 in words is "one billion, twenty-one million, three hundred twelve thousand, one hundred eleven".