2182681621 has 2 divisors, whose sum is σ = 2182681622. Its totient is φ = 2182681620.

The previous prime is 2182681619. The next prime is 2182681637. The reversal of 2182681621 is 1261862812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1802002500 + 380679121 = 42450^2 + 19511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2182681621 - 2¹ = 2182681619 is a prime.

Together with 2182681619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2182681651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091340810 + 1091340811.

It is an arithmetic number, because the mean of its divisors is an integer number (1091340811).

Almost surely, 2^2182681621 is an apocalyptic number.

It is an amenable number.

2182681621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2182681621 is an equidigital number, since it uses as much as digits as its factorization.

2182681621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 2182681621 is about 46719.1782997090. The cubic root of 2182681621 is about 1297.1697046236.

The spelling of 2182681621 in words is "two billion, one hundred eighty-two million, six hundred eighty-one thousand, six hundred twenty-one".