2237645021 has 2 divisors, whose sum is σ = 2237645022. Its totient is φ = 2237645020.

The previous prime is 2237644993. The next prime is 2237645023. The reversal of 2237645021 is 1205467322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1437547225 + 800097796 = 37915^2 + 28286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2237645021 - 2⁶ = 2237644957 is a prime.

Together with 2237645023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2237645023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1118822510 + 1118822511.

It is an arithmetic number, because the mean of its divisors is an integer number (1118822511).

Almost surely, 2^2237645021 is an apocalyptic number.

It is an amenable number.

2237645021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2237645021 is an equidigital number, since it uses as much as digits as its factorization.

2237645021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 2237645021 is about 47303.7527158258. The cubic root of 2237645021 is about 1307.9678339794.

The spelling of 2237645021 in words is "two billion, two hundred thirty-seven million, six hundred forty-five thousand, twenty-one".