2021551513 has 2 divisors, whose sum is σ = 2021551514. Its totient is φ = 2021551512.

The previous prime is 2021551507. The next prime is 2021551579. The reversal of 2021551513 is 3151551202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1866499209 + 155052304 = 43203^2 + 12452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021551513 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021551613) 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, 1010775756 + 1010775757.

It is an arithmetic number, because the mean of its divisors is an integer number (1010775757).

Almost surely, 2^2021551513 is an apocalyptic number.

It is an amenable number.

2021551513 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021551513 is an equidigital number, since it uses as much as digits as its factorization.

2021551513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 2021551513 is about 44961.6671510299. The cubic root of 2021551513 is about 1264.4304253107.

The spelling of 2021551513 in words is "two billion, twenty-one million, five hundred fifty-one thousand, five hundred thirteen".