12021021321 has 8 divisors (see below), whose sum is σ = 16029297504. Its totient is φ = 8013379680.

The previous prime is 12021021293. The next prime is 12021021329. The reversal of 12021021321 is 12312012021.

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

It is a de Polignac number, because none of the positive numbers 2^k-12021021321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12021021321.

It is not an unprimeable number, because it can be changed into a prime (12021021329) 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, 112515 + ... + 191576.

It is an arithmetic number, because the mean of its divisors is an integer number (2003662188).

Almost surely, 2^12021021321 is an apocalyptic number.

It is an amenable number.

12021021321 is a deficient number, since it is larger than the sum of its proper divisors (4008276183).

12021021321 is a wasteful number, since it uses less digits than its factorization.

12021021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317271.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12021021321 its reverse (12312012021), we get a palindrome (24333033342).

The spelling of 12021021321 in words is "twelve billion, twenty-one million, twenty-one thousand, three hundred twenty-one".