12212121201021 has 32 divisors (see below), whose sum is σ = 20682872121600. Its totient is φ = 6976240603200.

The previous prime is 12212121201017. The next prime is 12212121201031. The reversal of 12212121201021 is 12010212121221.

It is not a de Polignac number, because 12212121201021 - 2² = 12212121201017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212121200985 and 12212121201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212121201031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9163206 + ... + 10410983.

It is an arithmetic number, because the mean of its divisors is an integer number (646339753800).

Almost surely, 2^{12212121201021} is an apocalyptic number.

It is an amenable number.

12212121201021 is a deficient number, since it is larger than the sum of its proper divisors (8470750920579).

12212121201021 is a wasteful number, since it uses less digits than its factorization.

12212121201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19577506 (or 19577500 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12212121201021 its reverse (12010212121221), we get a palindrome (24222333322242).

The spelling of 12212121201021 in words is "twelve trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, twenty-one".