12021021101221 has 4 divisors (see below), whose sum is σ = 13113841201344. Its totient is φ = 10928201001100.

The previous prime is 12021021101209. The next prime is 12021021101249. The reversal of 12021021101221 is 12210112012021.

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 12021021101221 - 2¹⁵ = 12021021068453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021021101195 and 12021021101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021021101281) 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, 546410050045 + ... + 546410050066.

It is an arithmetic number, because the mean of its divisors is an integer number (3278460300336).

Almost surely, 2^{12021021101221} is an apocalyptic number.

12021021101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021021101221 is a deficient number, since it is larger than the sum of its proper divisors (1092820100123).

12021021101221 is a wasteful number, since it uses less digits than its factorization.

12021021101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092820100122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12021021101221 its reverse (12210112012021), we get a palindrome (24231133113242).

The spelling of 12021021101221 in words is "twelve trillion, twenty-one billion, twenty-one million, one hundred one thousand, two hundred twenty-one".