2151134441221 has 2 divisors, whose sum is σ = 2151134441222. Its totient is φ = 2151134441220.

The previous prime is 2151134441201. The next prime is 2151134441227. The reversal of 2151134441221 is 1221444311512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1634590377121 + 516544064100 = 1278511^2 + 718710^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151134441221 - 2³⁹ = 1601378627333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151134441227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075567220610 + 1075567220611.

It is an arithmetic number, because the mean of its divisors is an integer number (1075567220611).

Almost surely, 2^{2151134441221} is an apocalyptic number.

It is an amenable number.

2151134441221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151134441221 is an equidigital number, since it uses as much as digits as its factorization.

2151134441221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

Adding to 2151134441221 its reverse (1221444311512), we get a palindrome (3372578752733).

The spelling of 2151134441221 in words is "two trillion, one hundred fifty-one billion, one hundred thirty-four million, four hundred forty-one thousand, two hundred twenty-one".