1221121221202 has 16 divisors (see below), whose sum is σ = 1943267927040. Its totient is φ = 573871305168.

The previous prime is 1221121221149. The next prime is 1221121221217. The reversal of 1221121221202 is 2021221211221.

It is a super-2 number, since 2×1221121221202² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 1221121221202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126510013 + ... + 126519664.

It is an arithmetic number, because the mean of its divisors is an integer number (121454245440).

Almost surely, 2^{1221121221202} is an apocalyptic number.

1221121221202 is a deficient number, since it is larger than the sum of its proper divisors (722146705838).

1221121221202 is a wasteful number, since it uses less digits than its factorization.

1221121221202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253029825.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221121221202 its reverse (2021221211221), we get a palindrome (3242342432423).

The spelling of 1221121221202 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred two".