2000000021221 has 4 divisors (see below), whose sum is σ = 2037735870732. Its totient is φ = 1962264171712.

The previous prime is 2000000021213. The next prime is 2000000021281. The reversal of 2000000021221 is 1221200000002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1563725240100 + 436274781121 = 1250490^2 + 660511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000000021221 - 2³ = 2000000021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2000000021198 and 2000000021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000000021281) 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, 18867924676 + ... + 18867924781.

It is an arithmetic number, because the mean of its divisors is an integer number (509433967683).

Almost surely, 2^{2000000021221} is an apocalyptic number.

It is an amenable number.

2000000021221 is a deficient number, since it is larger than the sum of its proper divisors (37735849511).

2000000021221 is an equidigital number, since it uses as much as digits as its factorization.

2000000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37735849510.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2000000021221 its reverse (1221200000002), we get a palindrome (3221200021223).

It can be divided in two parts, 200000002 and 1221, that multiplied together give a palindrome (244200002442).

The spelling of 2000000021221 in words is "two trillion, twenty-one thousand, two hundred twenty-one".