1220012021121 has 8 divisors (see below), whose sum is σ = 1626689237184. Its totient is φ = 813338076240.

The previous prime is 1220012021101. The next prime is 1220012021141. The reversal of 1220012021121 is 1211202100221.

It is an interprime number because it is at equal distance from previous prime (1220012021101) and next prime (1220012021141).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220012021121 - 2¹¹ = 1220012019073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220012021121.

It is not an unprimeable number, because it can be changed into a prime (1220012021101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252580 + ... + 1582346.

It is an arithmetic number, because the mean of its divisors is an integer number (203336154648).

Almost surely, 2^{1220012021121} is an apocalyptic number.

It is an amenable number.

1220012021121 is a deficient number, since it is larger than the sum of its proper divisors (406677216063).

1220012021121 is a wasteful number, since it uses less digits than its factorization.

1220012021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635591.

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

Adding to 1220012021121 its reverse (1211202100221), we get a palindrome (2431214121342).

The spelling of 1220012021121 in words is "one trillion, two hundred twenty billion, twelve million, twenty-one thousand, one hundred twenty-one".