101221010123 has 4 divisors (see below), whose sum is σ = 101264399088. Its totient is φ = 101177621160.

The previous prime is 101221010113. The next prime is 101221010147. The reversal of 101221010123 is 321010122101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321010122101 = 81839 ⋅3922459.

It is a cyclic number.

It is not a de Polignac number, because 101221010123 - 2¹² = 101221006027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221010098 and 101221010107.

It is not an unprimeable number, because it can be changed into a prime (101221010113) 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 3 ways as a sum of consecutive naturals, for example, 21690983 + ... + 21695648.

It is an arithmetic number, because the mean of its divisors is an integer number (25316099772).

Almost surely, 2^101221010123 is an apocalyptic number.

101221010123 is a deficient number, since it is larger than the sum of its proper divisors (43388965).

101221010123 is an equidigital number, since it uses as much as digits as its factorization.

101221010123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43388964.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 101221010123 its reverse (321010122101), we get a palindrome (422231132224).

The spelling of 101221010123 in words is "one hundred one billion, two hundred twenty-one million, ten thousand, one hundred twenty-three".