2122100200021 has 2 divisors, whose sum is σ = 2122100200022. Its totient is φ = 2122100200020.

The previous prime is 2122100200013. The next prime is 2122100200039. The reversal of 2122100200021 is 1200020012212.

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., 1813975291921 + 308124908100 = 1346839^2 + 555090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122100200021 - 2³ = 2122100200013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2122100199974 and 2122100200010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122100200091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061050100010 + 1061050100011.

It is an arithmetic number, because the mean of its divisors is an integer number (1061050100011).

Almost surely, 2^{2122100200021} is an apocalyptic number.

It is an amenable number.

2122100200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122100200021 is an equidigital number, since it uses as much as digits as its factorization.

2122100200021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2122100200021 its reverse (1200020012212), we get a palindrome (3322120212233).

The spelling of 2122100200021 in words is "two trillion, one hundred twenty-two billion, one hundred million, two hundred thousand, twenty-one".