2120220021021 has 16 divisors (see below), whose sum is σ = 2869881443136. Its totient is φ = 1392076008576.

The previous prime is 2120220020993. The next prime is 2120220021041. The reversal of 2120220021021 is 1201200220212.

It is not a de Polignac number, because 2120220021021 - 2⁶ = 2120220020957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120220021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6937810 + ... + 7236963.

It is an arithmetic number, because the mean of its divisors is an integer number (179367590196).

Almost surely, 2^{2120220021021} is an apocalyptic number.

It is an amenable number.

2120220021021 is a deficient number, since it is larger than the sum of its proper divisors (749661422115).

2120220021021 is a wasteful number, since it uses less digits than its factorization.

2120220021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14175532.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2120220021021 its reverse (1201200220212), we get a palindrome (3321420241233).

The spelling of 2120220021021 in words is "two trillion, one hundred twenty billion, two hundred twenty million, twenty-one thousand, twenty-one".