1220012011221 has 4 divisors (see below), whose sum is σ = 1626682681632. Its totient is φ = 813341340812.

The previous prime is 1220012011217. The next prime is 1220012011241. The reversal of 1220012011221 is 1221102100221.

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 a cyclic number.

It is not a de Polignac number, because 1220012011221 - 2² = 1220012011217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220012011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220012011241) 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, 203335335201 + ... + 203335335206.

It is an arithmetic number, because the mean of its divisors is an integer number (406670670408).

Almost surely, 2^{1220012011221} is an apocalyptic number.

It is an amenable number.

1220012011221 is a deficient number, since it is larger than the sum of its proper divisors (406670670411).

1220012011221 is an equidigital number, since it uses as much as digits as its factorization.

1220012011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406670670410.

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

Adding to 1220012011221 its reverse (1221102100221), we get a palindrome (2441114111442).

The spelling of 1220012011221 in words is "one trillion, two hundred twenty billion, twelve million, eleven thousand, two hundred twenty-one".