102011123 has 4 divisors (see below), whose sum is σ = 102131568. Its totient is φ = 101890680.

The previous prime is 102011113. The next prime is 102011191. The reversal of 102011123 is 321110201.

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

It is a cyclic number.

It is not a de Polignac number, because 102011123 - 2¹⁰ = 102010099 is a prime.

It is a super-2 number, since 2×102011123² = 20812538431442258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102011113) 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, 58943 + ... + 60648.

It is an arithmetic number, because the mean of its divisors is an integer number (25532892).

Almost surely, 2^102011123 is an apocalyptic number.

102011123 is a deficient number, since it is larger than the sum of its proper divisors (120445).

102011123 is an equidigital number, since it uses as much as digits as its factorization.

102011123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120444.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 102011123 is about 10100.0555939064. The cubic root of 102011123 is about 467.2498559804.

Adding to 102011123 its reverse (321110201), we get a palindrome (423121324).

The spelling of 102011123 in words is "one hundred two million, eleven thousand, one hundred twenty-three".