2051030021 has 2 divisors, whose sum is σ = 2051030022. Its totient is φ = 2051030020.

The previous prime is 2051030011. The next prime is 2051030041. The reversal of 2051030021 is 1200301502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1962933025 + 88096996 = 44305^2 + 9386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051030021 - 2¹⁰ = 2051028997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2051029978 and 2051030005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051030011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025515010 + 1025515011.

It is an arithmetic number, because the mean of its divisors is an integer number (1025515011).

Almost surely, 2^2051030021 is an apocalyptic number.

It is an amenable number.

2051030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051030021 is an equidigital number, since it uses as much as digits as its factorization.

2051030021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2051030021 is about 45288.2989413380. The cubic root of 2051030021 is about 1270.5468166273.

Adding to 2051030021 its reverse (1200301502), we get a palindrome (3251331523).

The spelling of 2051030021 in words is "two billion, fifty-one million, thirty thousand, twenty-one".