1220121111001 has 8 divisors (see below), whose sum is σ = 1383133243520. Its totient is φ = 1066988501712.

The previous prime is 1220121110983. The next prime is 1220121111019. The reversal of 1220121111001 is 1001111210221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220121110983) and next prime (1220121111019).

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

It is a cyclic number.

It is not a de Polignac number, because 1220121111001 - 2¹¹ = 1220121108953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220121111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2469880545 + ... + 2469881038.

It is an arithmetic number, because the mean of its divisors is an integer number (172891655440).

Almost surely, 2^{1220121111001} is an apocalyptic number.

It is an amenable number.

1220121111001 is a deficient number, since it is larger than the sum of its proper divisors (163012132519).

1220121111001 is a wasteful number, since it uses less digits than its factorization.

1220121111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4939761615.

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

Adding to 1220121111001 its reverse (1001111210221), we get a palindrome (2221232321222).

The spelling of 1220121111001 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, one".