2221221121002 has 32 divisors (see below), whose sum is σ = 5315742855360. Its totient is φ = 683452652400.

The previous prime is 2221221121001. The next prime is 2221221121003. The reversal of 2221221121002 is 2001211221222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2221221121001) and next prime (2221221121003).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2221221121001) 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, 1582065624 + ... + 1582067027.

It is an arithmetic number, because the mean of its divisors is an integer number (166116964230).

Almost surely, 2^{2221221121002} is an apocalyptic number.

2221221121002 is an abundant number, since it is smaller than the sum of its proper divisors (3094521734358).

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

2221221121002 is a wasteful number, since it uses less digits than its factorization.

2221221121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164132675 (or 3164132669 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221221121002 its reverse (2001211221222), we get a palindrome (4222432342224).

The spelling of 2221221121002 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two".