2121020202011 has 4 divisors (see below), whose sum is σ = 2129084917872. Its totient is φ = 2112955486152.

The previous prime is 2121020201981. The next prime is 2121020202101. The reversal of 2121020202011 is 1102020201212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121020202011 - 2¹⁸ = 2121019939867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121020202211) 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, 4032357536 + ... + 4032358061.

It is an arithmetic number, because the mean of its divisors is an integer number (532271229468).

Almost surely, 2^{2121020202011} is an apocalyptic number.

2121020202011 is a deficient number, since it is larger than the sum of its proper divisors (8064715861).

2121020202011 is an equidigital number, since it uses as much as digits as its factorization.

2121020202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064715860.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2121020202011 its reverse (1102020201212), we get a palindrome (3223040403223).

The spelling of 2121020202011 in words is "two trillion, one hundred twenty-one billion, twenty million, two hundred two thousand, eleven".