2121020303221 has 8 divisors (see below), whose sum is σ = 2142973176344. Its totient is φ = 2099069199360.

The previous prime is 2121020303137. The next prime is 2121020303249. The reversal of 2121020303221 is 1223030201212.

It can be written as a sum of positive squares in 4 ways, for example, as 375173400196 + 1745846903025 = 612514^2 + 1321305^2 .

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 2121020303221 - 2¹³ = 2121020295029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020303021) 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, 2039401 + ... + 2898481.

It is an arithmetic number, because the mean of its divisors is an integer number (267871647043).

Almost surely, 2^{2121020303221} is an apocalyptic number.

It is an amenable number.

2121020303221 is a deficient number, since it is larger than the sum of its proper divisors (21952873123).

2121020303221 is an equidigital number, since it uses as much as digits as its factorization.

2121020303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884631.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 2121020303221 its reverse (1223030201212), we get a palindrome (3344050504433).

The spelling of 2121020303221 in words is "two trillion, one hundred twenty-one billion, twenty million, three hundred three thousand, two hundred twenty-one".