21030334121 has 12 divisors (see below), whose sum is σ = 21675715740. Its totient is φ = 20401455360.

The previous prime is 21030334111. The next prime is 21030334123. The reversal of 21030334121 is 12143303012.

It can be written as a sum of positive squares in 6 ways, for example, as 1329404521 + 19700929600 = 36461^2 + 140360^2 .

It is not a de Polignac number, because 21030334121 - 2¹⁸ = 21030071977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030334093 and 21030334102.

It is not an unprimeable number, because it can be changed into a prime (21030334123) 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 in 11 ways as a sum of consecutive naturals, for example, 207941 + ... + 292061.

It is an arithmetic number, because the mean of its divisors is an integer number (1806309645).

Almost surely, 2^21030334121 is an apocalyptic number.

It is an amenable number.

21030334121 is a deficient number, since it is larger than the sum of its proper divisors (645381619).

21030334121 is an frugal number, since it uses more digits than its factorization.

21030334121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84316 (or 84263 counting only the distinct ones).

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

Adding to 21030334121 its reverse (12143303012), we get a palindrome (33173637133).

The spelling of 21030334121 in words is "twenty-one billion, thirty million, three hundred thirty-four thousand, one hundred twenty-one".