1200221010121 has 6 divisors (see below), whose sum is σ = 1396175460810. Its totient is φ = 1028760865776.

The previous prime is 1200221010101. The next prime is 1200221010127. The reversal of 1200221010121 is 1210101220021.

It can be written as a sum of positive squares in only one way, i.e., 1155979777225 + 44241232896 = 1075165^2 + 210336^2 .

It is not a de Polignac number, because 1200221010121 - 2⁷ = 1200221009993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200221010127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12247153116 + ... + 12247153213.

It is an arithmetic number, because the mean of its divisors is an integer number (232695910135).

Almost surely, 2^{1200221010121} is an apocalyptic number.

It is an amenable number.

1200221010121 is a deficient number, since it is larger than the sum of its proper divisors (195954450689).

1200221010121 is an equidigital number, since it uses as much as digits as its factorization.

1200221010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24494306343 (or 24494306336 counting only the distinct ones).

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

Adding to 1200221010121 its reverse (1210101220021), we get a palindrome (2410322230142).

The spelling of 1200221010121 in words is "one trillion, two hundred billion, two hundred twenty-one million, ten thousand, one hundred twenty-one".