1221111001012 has 48 divisors (see below), whose sum is σ = 2522275667968. Its totient is φ = 506195969760.

The previous prime is 1221111001001. The next prime is 1221111001021. The reversal of 1221111001012 is 2101001111221.

It is a happy number.

It is a super-2 number, since 2×1221111001012² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221111000983 and 1221111001001.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1370713 + ... + 2078719.

Almost surely, 2^{1221111001012} is an apocalyptic number.

It is an amenable number.

1221111001012 is an abundant number, since it is smaller than the sum of its proper divisors (1301164666956).

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

1221111001012 is a wasteful number, since it uses less digits than its factorization.

1221111001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710036 (or 710034 counting only the distinct ones).

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

Adding to 1221111001012 its reverse (2101001111221), we get a palindrome (3322112112233).

The spelling of 1221111001012 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one thousand, twelve".