2120010220021 has 2 divisors, whose sum is σ = 2120010220022. Its totient is φ = 2120010220020.

The previous prime is 2120010220019. The next prime is 2120010220109. The reversal of 2120010220021 is 1200220100212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117170502500 + 2839717521 = 1455050^2 + 53289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120010220021 - 2¹ = 2120010220019 is a prime.

Together with 2120010220019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2120010219983 and 2120010220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120010220621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060005110010 + 1060005110011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060005110011).

Almost surely, 2^{2120010220021} is an apocalyptic number.

It is an amenable number.

2120010220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120010220021 is an equidigital number, since it uses as much as digits as its factorization.

2120010220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2120010220021 its reverse (1200220100212), we get a palindrome (3320230320233).

The spelling of 2120010220021 in words is "two trillion, one hundred twenty billion, ten million, two hundred twenty thousand, twenty-one".