1111222121001 has 128 divisors (see below), whose sum is σ = 1632948387840. Its totient is φ = 670602240000.

The previous prime is 1111222120973. The next prime is 1111222121011. The reversal of 1111222121001 is 1001212221111.

It is a happy number.

It is not a de Polignac number, because 1111222121001 - 2⁶ = 1111222120937 is a prime.

It is a super-2 number, since 2×1111222121001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1111222121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3954526981 + ... + 3954527261.

It is an arithmetic number, because the mean of its divisors is an integer number (12757409280).

Almost surely, 2^{1111222121001} is an apocalyptic number.

It is an amenable number.

1111222121001 is a deficient number, since it is larger than the sum of its proper divisors (521726266839).

1111222121001 is a wasteful number, since it uses less digits than its factorization.

1111222121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1111222121001 its reverse (1001212221111), we get a palindrome (2112434342112).

The spelling of 1111222121001 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, one".