212020001001221 has 4 divisors (see below), whose sum is σ = 242308572572832. Its totient is φ = 181731429429612.

The previous prime is 212020001001199. The next prime is 212020001001253. The reversal of 212020001001221 is 122100100020212.

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-212020001001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212020001001196 and 212020001001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020001006221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15144285785795 + ... + 15144285785808.

It is an arithmetic number, because the mean of its divisors is an integer number (60577143143208).

Almost surely, 2^{212020001001221} is an apocalyptic number.

It is an amenable number.

212020001001221 is a deficient number, since it is larger than the sum of its proper divisors (30288571571611).

212020001001221 is an equidigital number, since it uses as much as digits as its factorization.

212020001001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30288571571610.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212020001001221 its reverse (122100100020212), we get a palindrome (334120101021433).

The spelling of 212020001001221 in words is "two hundred twelve trillion, twenty billion, one million, one thousand, two hundred twenty-one".