1002121222121 has 4 divisors (see below), whose sum is σ = 1002548204112. Its totient is φ = 1001694240132.

The previous prime is 1002121222117. The next prime is 1002121222133. The reversal of 1002121222121 is 1212221212001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1002121222121 - 2² = 1002121222117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1002121222121.

It is not an unprimeable number, because it can be changed into a prime (1002121222171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213487475 + ... + 213492168.

It is an arithmetic number, because the mean of its divisors is an integer number (250637051028).

Almost surely, 2^{1002121222121} is an apocalyptic number.

It is an amenable number.

1002121222121 is a deficient number, since it is larger than the sum of its proper divisors (426981991).

1002121222121 is an equidigital number, since it uses as much as digits as its factorization.

1002121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426981990.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1002121222121 its reverse (1212221212001), we get a palindrome (2214342434122).

The spelling of 1002121222121 in words is "one trillion, two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".