2120202022121 has 4 divisors (see below), whose sum is σ = 2120514236544. Its totient is φ = 2119889807700.

The previous prime is 2120202022117. The next prime is 2120202022151. The reversal of 2120202022121 is 1212202020212.

It is a happy number.

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 2120202022121 - 2² = 2120202022117 is a prime.

It is a super-2 number, since 2×2120202022121² (a number of 25 digits) contains 22 as substring.

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 2120202022121.

It is not an unprimeable number, because it can be changed into a prime (2120202022151) 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, 156097025 + ... + 156110606.

It is an arithmetic number, because the mean of its divisors is an integer number (530128559136).

Almost surely, 2^{2120202022121} is an apocalyptic number.

It is an amenable number.

2120202022121 is a deficient number, since it is larger than the sum of its proper divisors (312214423).

2120202022121 is an equidigital number, since it uses as much as digits as its factorization.

2120202022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312214422.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2120202022121 its reverse (1212202020212), we get a palindrome (3332404042333).

The spelling of 2120202022121 in words is "two trillion, one hundred twenty billion, two hundred two million, twenty-two thousand, one hundred twenty-one".