1221002102012 has 24 divisors (see below), whose sum is σ = 2664004586880. Its totient is φ = 475715104560.

The previous prime is 1221002101997. The next prime is 1221002102029. The reversal of 1221002102012 is 2102012001221.

It is a super-2 number, since 2×1221002102012² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

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, 1982145962 + ... + 1982146577.

It is an arithmetic number, because the mean of its divisors is an integer number (111000191120).

Almost surely, 2^{1221002102012} is an apocalyptic number.

It is an amenable number.

1221002102012 is an abundant number, since it is smaller than the sum of its proper divisors (1443002484868).

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

1221002102012 is a wasteful number, since it uses less digits than its factorization.

1221002102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964292561 (or 3964292559 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221002102012 its reverse (2102012001221), we get a palindrome (3323014103233).

The spelling of 1221002102012 in words is "one trillion, two hundred twenty-one billion, two million, one hundred two thousand, twelve".