1221202120002 has 32 divisors (see below), whose sum is σ = 2489775962688. Its totient is φ = 399180040896.

The previous prime is 1221202119997. The next prime is 1221202120009. The reversal of 1221202120002 is 2000212021221.

It is not an unprimeable number, because it can be changed into a prime (1221202120009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378648 + ... + 1608035.

It is an arithmetic number, because the mean of its divisors is an integer number (77805498834).

Almost surely, 2^{1221202120002} is an apocalyptic number.

1221202120002 is an abundant number, since it is smaller than the sum of its proper divisors (1268573842686).

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

1221202120002 is a wasteful number, since it uses less digits than its factorization.

1221202120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988674.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221202120002 its reverse (2000212021221), we get a palindrome (3221414141223).

The spelling of 1221202120002 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty thousand, two".