2031202120021 has 2 divisors, whose sum is σ = 2031202120022. Its totient is φ = 2031202120020.

The previous prime is 2031202119967. The next prime is 2031202120063. The reversal of 2031202120021 is 1200212021302.

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., 1858420571121 + 172781548900 = 1363239^2 + 415670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031202120021 - 2³⁹ = 1481446306133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2031202119977 and 2031202120004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031202120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015601060010 + 1015601060011.

It is an arithmetic number, because the mean of its divisors is an integer number (1015601060011).

Almost surely, 2^{2031202120021} is an apocalyptic number.

It is an amenable number.

2031202120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031202120021 is an equidigital number, since it uses as much as digits as its factorization.

2031202120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2031202120021 its reverse (1200212021302), we get a palindrome (3231414141323).

The spelling of 2031202120021 in words is "two trillion, thirty-one billion, two hundred two million, one hundred twenty thousand, twenty-one".