101221001123 has 4 divisors (see below), whose sum is σ = 110422910328. Its totient is φ = 92019091920.

The previous prime is 101221001111. The next prime is 101221001143. The reversal of 101221001123 is 321100122101.

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 101221001123 - 2¹⁸ = 101220738979 is a prime.

It is a super-2 number, since 2×101221001123² (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 = 101221001098 and 101221001107.

It is not an unprimeable number, because it can be changed into a prime (101221001143) 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, 4600954586 + ... + 4600954607.

It is an arithmetic number, because the mean of its divisors is an integer number (27605727582).

Almost surely, 2^101221001123 is an apocalyptic number.

101221001123 is a deficient number, since it is larger than the sum of its proper divisors (9201909205).

101221001123 is an equidigital number, since it uses as much as digits as its factorization.

101221001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201909204.

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

Adding to 101221001123 its reverse (321100122101), we get a palindrome (422321123224).

The spelling of 101221001123 in words is "one hundred one billion, two hundred twenty-one million, one thousand, one hundred twenty-three".