1201122001221 has 4 divisors (see below), whose sum is σ = 1601496001632. Its totient is φ = 800748000812.

The previous prime is 1201122001213. The next prime is 1201122001229. The reversal of 1201122001221 is 1221002211021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1201122001213) and next prime (1201122001229).

It is a cyclic number.

It is not a de Polignac number, because 1201122001221 - 2³ = 1201122001213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201122001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122001229) 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, 200187000201 + ... + 200187000206.

It is an arithmetic number, because the mean of its divisors is an integer number (400374000408).

Almost surely, 2^{1201122001221} is an apocalyptic number.

It is an amenable number.

1201122001221 is a deficient number, since it is larger than the sum of its proper divisors (400374000411).

1201122001221 is an equidigital number, since it uses as much as digits as its factorization.

1201122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400374000410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201122001221 its reverse (1221002211021), we get a palindrome (2422124212242).

The spelling of 1201122001221 in words is "one trillion, two hundred one billion, one hundred twenty-two million, one thousand, two hundred twenty-one".