2121020000251 has 2 divisors, whose sum is σ = 2121020000252. Its totient is φ = 2121020000250.

The previous prime is 2121020000201. The next prime is 2121020000257. The reversal of 2121020000251 is 1520000201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121020000251 - 2²⁵ = 2120986445819 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121020000257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510000125 + 1060510000126.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510000126).

Almost surely, 2^{2121020000251} is an apocalyptic number.

2121020000251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121020000251 is an equidigital number, since it uses as much as digits as its factorization.

2121020000251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 2121020000251 its reverse (1520000201212), we get a palindrome (3641020201463).

The spelling of 2121020000251 in words is "two trillion, one hundred twenty-one billion, twenty million, two hundred fifty-one", and thus it is an aban number.