1020111123 has 4 divisors (see below), whose sum is σ = 1360148168. Its totient is φ = 680074080.

The previous prime is 1020111107. The next prime is 1020111149. The reversal of 1020111123 is 3211110201.

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

It is not a de Polignac number, because 1020111123 - 2⁴ = 1020111107 is a prime.

It is a super-2 number, since 2×1020111123² = 2081253406536642258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020111099 and 1020111108.

It is not an unprimeable number, because it can be changed into a prime (1020111623) 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, 170018518 + ... + 170018523.

It is an arithmetic number, because the mean of its divisors is an integer number (340037042).

Almost surely, 2^1020111123 is an apocalyptic number.

1020111123 is a deficient number, since it is larger than the sum of its proper divisors (340037045).

1020111123 is an equidigital number, since it uses as much as digits as its factorization.

1020111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340037044.

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

The square root of 1020111123 is about 31939.1784960102. The cubic root of 1020111123 is about 1006.6592634403.

Adding to 1020111123 its reverse (3211110201), we get a palindrome (4231221324).

The spelling of 1020111123 in words is "one billion, twenty million, one hundred eleven thousand, one hundred twenty-three".