21031034121 has 12 divisors (see below), whose sum is σ = 30383169648. Its totient is φ = 14018377464.

The previous prime is 21031034113. The next prime is 21031034149. The reversal of 21031034121 is 12143013012.

21031034121 is a `hidden beast` number, since 2 + 10 + 310 + 341 + 2 + 1 = 666.

It is not a de Polignac number, because 21031034121 - 2³ = 21031034113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031034094 and 21031034103.

It is not an unprimeable number, because it can be changed into a prime (21031034191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134115 + ... + 245048.

It is an arithmetic number, because the mean of its divisors is an integer number (2531930804).

Almost surely, 2^21031034121 is an apocalyptic number.

It is an amenable number.

21031034121 is a deficient number, since it is larger than the sum of its proper divisors (9352135527).

21031034121 is a wasteful number, since it uses less digits than its factorization.

21031034121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385332 (or 385329 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21031034121 its reverse (12143013012), we get a palindrome (33174047133).

The spelling of 21031034121 in words is "twenty-one billion, thirty-one million, thirty-four thousand, one hundred twenty-one".