1001111222121 has 32 divisors (see below), whose sum is σ = 1416690057216. Its totient is φ = 627799248000.

The previous prime is 1001111222081. The next prime is 1001111222179. The reversal of 1001111222121 is 1212221111001.

It is a happy number.

It is not a de Polignac number, because 1001111222121 - 2⁶ = 1001111222057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001111222121.

It is not an unprimeable number, because it can be changed into a prime (1001111222521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 548910 + ... + 1517736.

It is an arithmetic number, because the mean of its divisors is an integer number (44271564288).

Almost surely, 2^{1001111222121} is an apocalyptic number.

It is an amenable number.

1001111222121 is a deficient number, since it is larger than the sum of its proper divisors (415578835095).

1001111222121 is a wasteful number, since it uses less digits than its factorization.

1001111222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969173.

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

Adding to 1001111222121 its reverse (1212221111001), we get a palindrome (2213332333122).

The spelling of 1001111222121 in words is "one trillion, one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".