12200220121 has 4 divisors (see below), whose sum is σ = 12201462244. Its totient is φ = 12198978000.

The previous prime is 12200220103. The next prime is 12200220127. The reversal of 12200220121 is 12102200221.

It is a happy number.

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 12051648400 + 148571721 = 109780^2 + 12189^2 .

It is a cyclic number.

It is not a de Polignac number, because 12200220121 - 2¹⁵ = 12200187353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12200220127) 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, 606210 + ... + 626011.

It is an arithmetic number, because the mean of its divisors is an integer number (3050365561).

Almost surely, 2^12200220121 is an apocalyptic number.

It is an amenable number.

12200220121 is a deficient number, since it is larger than the sum of its proper divisors (1242123).

12200220121 is an equidigital number, since it uses as much as digits as its factorization.

12200220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242122.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12200220121 its reverse (12102200221), we get a palindrome (24302420342).

The spelling of 12200220121 in words is "twelve billion, two hundred million, two hundred twenty thousand, one hundred twenty-one".