2144402021 has 2 divisors, whose sum is σ = 2144402022. Its totient is φ = 2144402020.

The previous prime is 2144401993. The next prime is 2144402047. The reversal of 2144402021 is 1202044412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1460004100 + 684397921 = 38210^2 + 26161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144402021 - 2⁶ = 2144401957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2144401984 and 2144402002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2144432021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072201010 + 1072201011.

It is an arithmetic number, because the mean of its divisors is an integer number (1072201011).

Almost surely, 2^2144402021 is an apocalyptic number.

It is an amenable number.

2144402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144402021 is an equidigital number, since it uses as much as digits as its factorization.

2144402021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2144402021 is about 46307.6885732812. The cubic root of 2144402021 is about 1289.5417359480.

Adding to 2144402021 its reverse (1202044412), we get a palindrome (3346446433).

The spelling of 2144402021 in words is "two billion, one hundred forty-four million, four hundred two thousand, twenty-one".