2212121001221 has 8 divisors (see below), whose sum is σ = 2263683321504. Its totient is φ = 2160564028560.

The previous prime is 2212121001217. The next prime is 2212121001239. The reversal of 2212121001221 is 1221001212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2212121001221 - 2² = 2212121001217 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 2212121001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212121001121) 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 7 ways as a sum of consecutive naturals, for example, 493811 + ... + 2160576.

It is an arithmetic number, because the mean of its divisors is an integer number (282960415188).

Almost surely, 2^{2212121001221} is an apocalyptic number.

It is an amenable number.

2212121001221 is a deficient number, since it is larger than the sum of its proper divisors (51562320283).

2212121001221 is a wasteful number, since it uses less digits than its factorization.

2212121001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673811.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2212121001221 its reverse (1221001212122), we get a palindrome (3433122213343).

The spelling of 2212121001221 in words is "two trillion, two hundred twelve billion, one hundred twenty-one million, one thousand, two hundred twenty-one".