121222201100021 has 12 divisors (see below), whose sum is σ = 143325278922060. Its totient is φ = 102201387341760.

The previous prime is 121222201100003. The next prime is 121222201100047. The reversal of 121222201100021 is 120001102222121.

It can be written as a sum of positive squares in 2 ways, for example, as 32236674730225 + 88985526369796 = 5677735^2 + 9433214^2 .

It is not a de Polignac number, because 121222201100021 - 2⁶ = 121222201099957 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 (121222201100081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20278050056 + ... + 20278056033.

It is an arithmetic number, because the mean of its divisors is an integer number (11943773243505).

Almost surely, 2^{121222201100021} is an apocalyptic number.

It is an amenable number.

121222201100021 is a deficient number, since it is larger than the sum of its proper divisors (22103077822039).

121222201100021 is an equidigital number, since it uses as much as digits as its factorization.

121222201100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40556106164 (or 40556106157 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121222201100021 its reverse (120001102222121), we get a palindrome (241223303322142).

The spelling of 121222201100021 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred thousand, twenty-one".