2121002212121 has 8 divisors (see below), whose sum is σ = 2285944935624. Its totient is φ = 1956315018240.

The previous prime is 2121002212073. The next prime is 2121002212141. The reversal of 2121002212121 is 1212122001212.

It can be written as a sum of positive squares in 4 ways, for example, as 133082688025 + 1987919524096 = 364805^2 + 1409936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121002212121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121002212121.

It is not an unprimeable number, because it can be changed into a prime (2121002212141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63865160 + ... + 63898361.

It is an arithmetic number, because the mean of its divisors is an integer number (285743116953).

Almost surely, 2^{2121002212121} is an apocalyptic number.

It is an amenable number.

2121002212121 is a deficient number, since it is larger than the sum of its proper divisors (164942723503).

2121002212121 is a wasteful number, since it uses less digits than its factorization.

2121002212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127764811.

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

Adding to 2121002212121 its reverse (1212122001212), we get a palindrome (3333124213333).

The spelling of 2121002212121 in words is "two trillion, one hundred twenty-one billion, two million, two hundred twelve thousand, one hundred twenty-one".