2120200120021 has 2 divisors, whose sum is σ = 2120200120022. Its totient is φ = 2120200120020.

The previous prime is 2120200119959. The next prime is 2120200120061. The reversal of 2120200120021 is 1200210020212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1609384018225 + 510816101796 = 1268615^2 + 714714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120200120021 - 2⁹ = 2120200119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120200119983 and 2120200120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120200120061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060100060010 + 1060100060011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060100060011).

Almost surely, 2^{2120200120021} is an apocalyptic number.

It is an amenable number.

2120200120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120200120021 is an equidigital number, since it uses as much as digits as its factorization.

2120200120021 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 2120200120021 its reverse (1200210020212), we get a palindrome (3320410140233).

The spelling of 2120200120021 in words is "two trillion, one hundred twenty billion, two hundred million, one hundred twenty thousand, twenty-one".