2131363621 has 2 divisors, whose sum is σ = 2131363622. Its totient is φ = 2131363620.

The previous prime is 2131363583. The next prime is 2131363649. The reversal of 2131363621 is 1263631312.

It is an a-pointer prime, because the next prime (2131363649) can be obtained adding 2131363621 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1963376100 + 167987521 = 44310^2 + 12961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131363621 - 2⁹ = 2131363109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131363621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131363681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065681810 + 1065681811.

It is an arithmetic number, because the mean of its divisors is an integer number (1065681811).

Almost surely, 2^2131363621 is an apocalyptic number.

It is an amenable number.

2131363621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131363621 is an equidigital number, since it uses as much as digits as its factorization.

2131363621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 2131363621 is about 46166.6938495708. The cubic root of 2131363621 is about 1286.9228624030.

Adding to 2131363621 its reverse (1263631312), we get a palindrome (3394994933).

The spelling of 2131363621 in words is "two billion, one hundred thirty-one million, three hundred sixty-three thousand, six hundred twenty-one".