1221200020002 has 32 divisors (see below), whose sum is σ = 2510887534272. Its totient is φ = 395673816384.

The previous prime is 1221200019953. The next prime is 1221200020009. The reversal of 1221200020002 is 2000200021221.

1221200020002 is a modest number, since divided by 20002 gives 12212 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1221200020002.

It is not an unprimeable number, because it can be changed into a prime (1221200020009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2490268 + ... + 2940039.

It is an arithmetic number, because the mean of its divisors is an integer number (78465235446).

Almost surely, 2^{1221200020002} is an apocalyptic number.

1221200020002 is an abundant number, since it is smaller than the sum of its proper divisors (1289687514270).

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

1221200020002 is a wasteful number, since it uses less digits than its factorization.

1221200020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431362.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1221200020002 its reverse (2000200021221), we get a palindrome (3221400041223).

It can be divided in two parts, 1221 and 200020002, that multiplied together give a palindrome (244224422442).

The spelling of 1221200020002 in words is "one trillion, two hundred twenty-one billion, two hundred million, twenty thousand, two".