2021000251 has 2 divisors, whose sum is σ = 2021000252. Its totient is φ = 2021000250.

The previous prime is 2021000147. The next prime is 2021000269. The reversal of 2021000251 is 1520001202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021000251 - 2⁷ = 2021000123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021000281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500125 + 1010500126.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500126).

Almost surely, 2^2021000251 is an apocalyptic number.

2021000251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000251 is an equidigital number, since it uses as much as digits as its factorization.

2021000251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2021000251 is about 44955.5363776254. The cubic root of 2021000251 is about 1264.3154812840.

Adding to 2021000251 its reverse (1520001202), we get a palindrome (3541001453).

The spelling of 2021000251 in words is "two billion, twenty-one million, two hundred fifty-one", and thus it is an aban number.