1021111023 has 4 divisors (see below), whose sum is σ = 1361481368. Its totient is φ = 680740680.

The previous prime is 1021110983. The next prime is 1021111043. The reversal of 1021111023 is 3201111201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1021111023 - 2¹⁷ = 1020979951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170185168 + ... + 170185173.

It is an arithmetic number, because the mean of its divisors is an integer number (340370342).

Almost surely, 2^1021111023 is an apocalyptic number.

1021111023 is a deficient number, since it is larger than the sum of its proper divisors (340370345).

1021111023 is an equidigital number, since it uses as much as digits as its factorization.

1021111023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340370344.

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

The square root of 1021111023 is about 31954.8278512027. The cubic root of 1021111023 is about 1006.9880609219.

Adding to 1021111023 its reverse (3201111201), we get a palindrome (4222222224).

The spelling of 1021111023 in words is "one billion, twenty-one million, one hundred eleven thousand, twenty-three".