21203302103021 has 2 divisors, whose sum is σ = 21203302103022. Its totient is φ = 21203302103020.

The previous prime is 21203302102987. The next prime is 21203302103029. The reversal of 21203302103021 is 12030120330212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11702488392100 + 9500813710921 = 3420890^2 + 3082339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203302103021 is a prime.

It is a super-2 number, since 2×21203302103021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203302102984 and 21203302103002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203302103029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601651051510 + 10601651051511.

It is an arithmetic number, because the mean of its divisors is an integer number (10601651051511).

Almost surely, 2^{21203302103021} is an apocalyptic number.

It is an amenable number.

21203302103021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203302103021 is an equidigital number, since it uses as much as digits as its factorization.

21203302103021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21203302103021 its reverse (12030120330212), we get a palindrome (33233422433233).

The spelling of 21203302103021 in words is "twenty-one trillion, two hundred three billion, three hundred two million, one hundred three thousand, twenty-one".