12210001001021 has 4 divisors (see below), whose sum is σ = 12210085177632. Its totient is φ = 12209916824412.

The previous prime is 12210001000991. The next prime is 12210001001047. The reversal of 12210001001021 is 12010010001221.

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 a de Polignac number, because none of the positive numbers 2^k-12210001001021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210001000993 and 12210001001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210001001071) 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, 41870351 + ... + 42160956.

It is an arithmetic number, because the mean of its divisors is an integer number (3052521294408).

Almost surely, 2^{12210001001021} is an apocalyptic number.

It is an amenable number.

12210001001021 is a deficient number, since it is larger than the sum of its proper divisors (84176611).

12210001001021 is an equidigital number, since it uses as much as digits as its factorization.

12210001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84176610.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12210001001021 its reverse (12010010001221), we get a palindrome (24220011002242).

The spelling of 12210001001021 in words is "twelve trillion, two hundred ten billion, one million, one thousand, twenty-one".