101212321123 has 4 divisors (see below), whose sum is σ = 105612856848. Its totient is φ = 96811785400.

The previous prime is 101212321121. The next prime is 101212321129. The reversal of 101212321123 is 321123212101.

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 101212321123 - 2¹ = 101212321121 is a prime.

It is a super-2 number, since 2×101212321123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101212321123.

It is not an unprimeable number, because it can be changed into a prime (101212321121) 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, 2200267828 + ... + 2200267873.

It is an arithmetic number, because the mean of its divisors is an integer number (26403214212).

Almost surely, 2^101212321123 is an apocalyptic number.

101212321123 is a deficient number, since it is larger than the sum of its proper divisors (4400535725).

101212321123 is an equidigital number, since it uses as much as digits as its factorization.

101212321123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400535724.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 101212321123 its reverse (321123212101), we get a palindrome (422335533224).

The spelling of 101212321123 in words is "one hundred one billion, two hundred twelve million, three hundred twenty-one thousand, one hundred twenty-three".