20121221321 has 8 divisors (see below), whose sum is σ = 20146999200. Its totient is φ = 20095463232.

The previous prime is 20121221311. The next prime is 20121221327. The reversal of 20121221321 is 12312212102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121221321 - 2³⁰ = 19047479497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20121221321.

It is not an unprimeable number, because it can be changed into a prime (20121221327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3179066 + ... + 3185388.

It is an arithmetic number, because the mean of its divisors is an integer number (2518374900).

Almost surely, 2^20121221321 is an apocalyptic number.

It is an amenable number.

20121221321 is a deficient number, since it is larger than the sum of its proper divisors (25777879).

20121221321 is a wasteful number, since it uses less digits than its factorization.

20121221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121221321 its reverse (12312212102), we get a palindrome (32433433423).

The spelling of 20121221321 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-one".