100201121221 has 4 divisors (see below), whose sum is σ = 100212262444. Its totient is φ = 100189980000.

The previous prime is 100201121213. The next prime is 100201121231. The reversal of 100201121221 is 122121102001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29623228996 + 70577892225 = 172114^2 + 265665^2 .

It is a cyclic number.

It is not a de Polignac number, because 100201121221 - 2³ = 100201121213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100201121231) 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, 5557110 + ... + 5575111.

It is an arithmetic number, because the mean of its divisors is an integer number (25053065611).

Almost surely, 2^100201121221 is an apocalyptic number.

It is an amenable number.

100201121221 is a deficient number, since it is larger than the sum of its proper divisors (11141223).

100201121221 is an equidigital number, since it uses as much as digits as its factorization.

100201121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11141222.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100201121221 its reverse (122121102001), we get a palindrome (222322223222).

The spelling of 100201121221 in words is "one hundred billion, two hundred one million, one hundred twenty-one thousand, two hundred twenty-one".