2011151550521 has 2 divisors, whose sum is σ = 2011151550522. Its totient is φ = 2011151550520.

The previous prime is 2011151550493. The next prime is 2011151550523. The reversal of 2011151550521 is 1250551511102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1668388138921 + 342763411600 = 1291661^2 + 585460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011151550521 - 2¹⁴ = 2011151534137 is a prime.

Together with 2011151550523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2011151550523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005575775260 + 1005575775261.

It is an arithmetic number, because the mean of its divisors is an integer number (1005575775261).

Almost surely, 2^{2011151550521} is an apocalyptic number.

It is an amenable number.

2011151550521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011151550521 is an equidigital number, since it uses as much as digits as its factorization.

2011151550521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2500, while the sum is 29.

The spelling of 2011151550521 in words is "two trillion, eleven billion, one hundred fifty-one million, five hundred fifty thousand, five hundred twenty-one".