1221112111002 has 16 divisors (see below), whose sum is σ = 2791113396672. Its totient is φ = 348889174560.

The previous prime is 1221112110997. The next prime is 1221112111007. The reversal of 1221112111002 is 2001112111221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221112110997) and next prime (1221112111007).

It is a super-2 number, since 2×1221112111002² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221112111007) 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 7 ways as a sum of consecutive naturals, for example, 14537048899 + ... + 14537048982.

It is an arithmetic number, because the mean of its divisors is an integer number (174444587292).

Almost surely, 2^{1221112111002} is an apocalyptic number.

1221112111002 is an abundant number, since it is smaller than the sum of its proper divisors (1570001285670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221112111002 is a wasteful number, since it uses less digits than its factorization.

1221112111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29074097893.

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

Adding to 1221112111002 its reverse (2001112111221), we get a palindrome (3222224222223).

The spelling of 1221112111002 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two".