21032002020121 has 2 divisors, whose sum is σ = 21032002020122. Its totient is φ = 21032002020120.

The previous prime is 21032002020091. The next prime is 21032002020137. The reversal of 21032002020121 is 12102020023012.

It is a happy number.

It is an a-pointer prime, because the next prime (21032002020137) can be obtained adding 21032002020121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13596623769600 + 7435378250521 = 3687360^2 + 2726789^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032002020121 - 2²⁵ = 21031968465689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21032002020095 and 21032002020104.

It is not a weakly prime, because it can be changed into another prime (21032002023121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516001010060 + 10516001010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10516001010061).

Almost surely, 2^{21032002020121} is an apocalyptic number.

It is an amenable number.

21032002020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032002020121 is an equidigital number, since it uses as much as digits as its factorization.

21032002020121 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 21032002020121 its reverse (12102020023012), we get a palindrome (33134022043133).

The spelling of 21032002020121 in words is "twenty-one trillion, thirty-two billion, two million, twenty thousand, one hundred twenty-one".