1200101111221 has 4 divisors (see below), whose sum is σ = 1270695294252. Its totient is φ = 1129506928192.

The previous prime is 1200101111219. The next prime is 1200101111381. The reversal of 1200101111221 is 1221111010021.

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 373792840996 + 826308270225 = 611386^2 + 909015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200101111221 - 2¹ = 1200101111219 is a prime.

It is a super-2 number, since 2×1200101111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200101111021) 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, 35297091490 + ... + 35297091523.

It is an arithmetic number, because the mean of its divisors is an integer number (317673823563).

Almost surely, 2^{1200101111221} is an apocalyptic number.

It is an amenable number.

1200101111221 is a deficient number, since it is larger than the sum of its proper divisors (70594183031).

1200101111221 is an equidigital number, since it uses as much as digits as its factorization.

1200101111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70594183030.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1200101111221 its reverse (1221111010021), we get a palindrome (2421212121242).

The spelling of 1200101111221 in words is "one trillion, two hundred billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".