20121042321 has 24 divisors (see below), whose sum is σ = 30339069696. Its totient is φ = 12825859200.

The previous prime is 20121042317. The next prime is 20121042353. The reversal of 20121042321 is 12324012102.

It is a happy number.

20121042321 is a `hidden beast` number, since 201 + 21 + 0 + 423 + 21 = 666.

It is not a de Polignac number, because 20121042321 - 2² = 20121042317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121042294 and 20121042303.

It is not an unprimeable number, because it can be changed into a prime (20120042321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 562456 + ... + 597158.

It is an arithmetic number, because the mean of its divisors is an integer number (1264127904).

Almost surely, 2^20121042321 is an apocalyptic number.

It is an amenable number.

20121042321 is a deficient number, since it is larger than the sum of its proper divisors (10218027375).

20121042321 is a wasteful number, since it uses less digits than its factorization.

20121042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37533 (or 37530 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20121042321 its reverse (12324012102), we get a palindrome (32445054423).

The spelling of 20121042321 in words is "twenty billion, one hundred twenty-one million, forty-two thousand, three hundred twenty-one".