2101000251 has 32 divisors (see below), whose sum is σ = 3411836928. Its totient is φ = 1123927200.

The previous prime is 2101000249. The next prime is 2101000289. The reversal of 2101000251 is 1520001012.

It is not a de Polignac number, because 2101000251 - 2¹ = 2101000249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101000211) 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 in 31 ways as a sum of consecutive naturals, for example, 23575 + ... + 68976.

It is an arithmetic number, because the mean of its divisors is an integer number (106619904).

Almost surely, 2^2101000251 is an apocalyptic number.

2101000251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2101000251 is a deficient number, since it is larger than the sum of its proper divisors (1310836677).

2101000251 is a wasteful number, since it uses less digits than its factorization.

2101000251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92631.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 2101000251 is about 45836.6692834460. The cubic root of 2101000251 is about 1280.7824502693.

Adding to 2101000251 its reverse (1520001012), we get a palindrome (3621001263).

The spelling of 2101000251 in words is "two billion, one hundred one million, two hundred fifty-one", and thus it is an aban number.