12021000132221 has 4 divisors (see below), whose sum is σ = 12021012717312. Its totient is φ = 12020987547132.

The previous prime is 12021000132199. The next prime is 12021000132287. The reversal of 12021000132221 is 12223100012021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12021000132221 - 2²⁶ = 12020933023357 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 12021000132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000132721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4730531 + ... + 6813216.

It is an arithmetic number, because the mean of its divisors is an integer number (3005253179328).

Almost surely, 2^{12021000132221} is an apocalyptic number.

It is an amenable number.

12021000132221 is a deficient number, since it is larger than the sum of its proper divisors (12585091).

12021000132221 is a wasteful number, since it uses less digits than its factorization.

12021000132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12585090.

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

Adding to 12021000132221 its reverse (12223100012021), we get a palindrome (24244100144242).

The spelling of 12021000132221 in words is "twelve trillion, twenty-one billion, one hundred thirty-two thousand, two hundred twenty-one".