2120001121221 has 8 divisors (see below), whose sum is σ = 2827174664544. Its totient is φ = 1413080829360.

The previous prime is 2120001121207. The next prime is 2120001121223. The reversal of 2120001121221 is 1221211000212.

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

It is not a de Polignac number, because 2120001121221 - 2¹³ = 2120001113029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120001121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120001121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63293331 + ... + 63326816.

It is an arithmetic number, because the mean of its divisors is an integer number (353396833068).

Almost surely, 2^{2120001121221} is an apocalyptic number.

It is an amenable number.

2120001121221 is a deficient number, since it is larger than the sum of its proper divisors (707173543323).

2120001121221 is a wasteful number, since it uses less digits than its factorization.

2120001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126625731.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2120001121221 its reverse (1221211000212), we get a palindrome (3341212121433).

The spelling of 2120001121221 in words is "two trillion, one hundred twenty billion, one million, one hundred twenty-one thousand, two hundred twenty-one".