1021111011 has 12 divisors (see below), whose sum is σ = 1479319192. Its totient is φ = 678718656.

The previous prime is 1021110983. The next prime is 1021111043. The reversal of 1021111011 is 1101111201.

It is not a de Polignac number, because 1021111011 - 2⁶ = 1021110947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021110984 and 1021111002.

It is not an unprimeable number, because it can be changed into a prime (1021111051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165301 + ... + 171366.

Almost surely, 2^1021111011 is an apocalyptic number.

1021111011 is a deficient number, since it is larger than the sum of its proper divisors (458208181).

1021111011 is a wasteful number, since it uses less digits than its factorization.

1021111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337010 (or 337007 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 1021111011 is about 31954.8276634376. The cubic root of 1021111011 is about 1006.9880569772.

Adding to 1021111011 its reverse (1101111201), we get a palindrome (2122222212).

The spelling of 1021111011 in words is "one billion, twenty-one million, one hundred eleven thousand, eleven".