100021220121 has 8 divisors (see below), whose sum is σ = 134656400320. Its totient is φ = 66033426672.

The previous prime is 100021220099. The next prime is 100021220129. The reversal of 100021220121 is 121022120001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100021220121 - 2⁹ = 100021219609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021220097 and 100021220106.

It is not an unprimeable number, because it can be changed into a prime (100021220129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161846326 + ... + 161846943.

It is an arithmetic number, because the mean of its divisors is an integer number (16832050040).

Almost surely, 2^100021220121 is an apocalyptic number.

It is an amenable number.

100021220121 is a deficient number, since it is larger than the sum of its proper divisors (34635180199).

100021220121 is a wasteful number, since it uses less digits than its factorization.

100021220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323693375.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 100021220121 its reverse (121022120001), we get a palindrome (221043340122).

The spelling of 100021220121 in words is "one hundred billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".