2051010821 has 2 divisors, whose sum is σ = 2051010822. Its totient is φ = 2051010820.

The previous prime is 2051010799. The next prime is 2051010839. The reversal of 2051010821 is 1280101502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2026260196 + 24750625 = 45014^2 + 4975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051010821 - 2²² = 2046816517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2051010793 and 2051010802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051010121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025505410 + 1025505411.

It is an arithmetic number, because the mean of its divisors is an integer number (1025505411).

Almost surely, 2^2051010821 is an apocalyptic number.

It is an amenable number.

2051010821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051010821 is an equidigital number, since it uses as much as digits as its factorization.

2051010821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 2051010821 is about 45288.0869655586. The cubic root of 2051010821 is about 1270.5428520217.

The spelling of 2051010821 in words is "two billion, fifty-one million, ten thousand, eight hundred twenty-one".