101221021123 has 4 divisors (see below), whose sum is σ = 101246774488. Its totient is φ = 101195267760.

The previous prime is 101221021091. The next prime is 101221021129. The reversal of 101221021123 is 321120122101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321120122101 = 181 ⋅1774144321.

It is a cyclic number.

It is not a de Polignac number, because 101221021123 - 2⁵ = 101221021091 is a prime.

It is a super-2 number, since 2×101221021123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101221021097 and 101221021106.

It is not an unprimeable number, because it can be changed into a prime (101221021129) 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, 12870786 + ... + 12878647.

It is an arithmetic number, because the mean of its divisors is an integer number (25311693622).

Almost surely, 2^101221021123 is an apocalyptic number.

101221021123 is a deficient number, since it is larger than the sum of its proper divisors (25753365).

101221021123 is an equidigital number, since it uses as much as digits as its factorization.

101221021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25753364.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 101221021123 its reverse (321120122101), we get a palindrome (422341143224).

The spelling of 101221021123 in words is "one hundred one billion, two hundred twenty-one million, twenty-one thousand, one hundred twenty-three".