2121030020205 has 40 divisors (see below), whose sum is σ = 3818051424000. Its totient is φ = 1126482837984.

The previous prime is 2121030020173. The next prime is 2121030020237. The reversal of 2121030020205 is 5020200301212.

It is an interprime number because it is at equal distance from previous prime (2121030020173) and next prime (2121030020237).

It is not a de Polignac number, because 2121030020205 - 2⁵ = 2121030020173 is a prime.

It is a super-2 number, since 2×2121030020205² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10859505 + ... + 11053094.

It is an arithmetic number, because the mean of its divisors is an integer number (95451285600).

Almost surely, 2^{2121030020205} is an apocalyptic number.

It is an amenable number.

2121030020205 is a deficient number, since it is larger than the sum of its proper divisors (1697021403795).

2121030020205 is a wasteful number, since it uses less digits than its factorization.

2121030020205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21912855 (or 21912846 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 2121030020205 its reverse (5020200301212), we get a palindrome (7141230321417).

The spelling of 2121030020205 in words is "two trillion, one hundred twenty-one billion, thirty million, twenty thousand, two hundred five".