2151586443221 has 2 divisors, whose sum is σ = 2151586443222. Its totient is φ = 2151586443220.

The previous prime is 2151586443151. The next prime is 2151586443233. The reversal of 2151586443221 is 1223446851512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2081368863025 + 70217580196 = 1442695^2 + 264986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151586443221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151586443241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075793221610 + 1075793221611.

It is an arithmetic number, because the mean of its divisors is an integer number (1075793221611).

Almost surely, 2^{2151586443221} is an apocalyptic number.

It is an amenable number.

2151586443221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151586443221 is an equidigital number, since it uses as much as digits as its factorization.

2151586443221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 460800, while the sum is 44.

The spelling of 2151586443221 in words is "two trillion, one hundred fifty-one billion, five hundred eighty-six million, four hundred forty-three thousand, two hundred twenty-one".