2120322320021 has 2 divisors, whose sum is σ = 2120322320022. Its totient is φ = 2120322320020.

The previous prime is 2120322319979. The next prime is 2120322320023. The reversal of 2120322320021 is 1200232230212.

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., 1483974694225 + 636347625796 = 1218185^2 + 797714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120322320021 - 2⁶ = 2120322319957 is a prime.

Together with 2120322320023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120322319975 and 2120322320002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120322320023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060161160010 + 1060161160011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060161160011).

Almost surely, 2^{2120322320021} is an apocalyptic number.

It is an amenable number.

2120322320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120322320021 is an equidigital number, since it uses as much as digits as its factorization.

2120322320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2120322320021 its reverse (1200232230212), we get a palindrome (3320554550233).

The spelling of 2120322320021 in words is "two trillion, one hundred twenty billion, three hundred twenty-two million, three hundred twenty thousand, twenty-one".