2121446621 has 6 divisors (see below), whose sum is σ = 2467805310. Its totient is φ = 1818382776.

The previous prime is 2121446597. The next prime is 2121446629. The reversal of 2121446621 is 1266441212.

It can be written as a sum of positive squares in only one way, i.e., 1758124900 + 363321721 = 41930^2 + 19061^2 .

It is not a de Polignac number, because 2121446621 - 2⁶ = 2121446557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121446629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21647366 + ... + 21647463.

It is an arithmetic number, because the mean of its divisors is an integer number (411300885).

Almost surely, 2^2121446621 is an apocalyptic number.

It is an amenable number.

2121446621 is a deficient number, since it is larger than the sum of its proper divisors (346358689).

2121446621 is an equidigital number, since it uses as much as digits as its factorization.

2121446621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43294843 (or 43294836 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 2121446621 is about 46059.1643541218. The cubic root of 2121446621 is about 1284.9237886236.

Adding to 2121446621 its reverse (1266441212), we get a palindrome (3387887833).

The spelling of 2121446621 in words is "two billion, one hundred twenty-one million, four hundred forty-six thousand, six hundred twenty-one".