100121202221 has 48 divisors (see below), whose sum is σ = 111309619200. Its totient is φ = 89789829696.

The previous prime is 100121202217. The next prime is 100121202239. The reversal of 100121202221 is 122202121001.

It is not a de Polignac number, because 100121202221 - 2² = 100121202217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121202196 and 100121202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121202421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 209021060 + ... + 209021538.

It is an arithmetic number, because the mean of its divisors is an integer number (2318950400).

Almost surely, 2^100121202221 is an apocalyptic number.

It is an amenable number.

100121202221 is a deficient number, since it is larger than the sum of its proper divisors (11188416979).

100121202221 is a wasteful number, since it uses less digits than its factorization.

100121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100121202221 its reverse (122202121001), we get a palindrome (222323323222).

The spelling of 100121202221 in words is "one hundred billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".