20102121210251 has 2 divisors, whose sum is σ = 20102121210252. Its totient is φ = 20102121210250.

The previous prime is 20102121210121. The next prime is 20102121210359. The reversal of 20102121210251 is 15201212120102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20102121210251 - 2¹⁴ = 20102121193867 is a prime.

It is not a weakly prime, because it can be changed into another prime (20102121240251) 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 as a sum of consecutive naturals, namely, 10051060605125 + 10051060605126.

It is an arithmetic number, because the mean of its divisors is an integer number (10051060605126).

Almost surely, 2^{20102121210251} is an apocalyptic number.

20102121210251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102121210251 is an equidigital number, since it uses as much as digits as its factorization.

20102121210251 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20102121210251 its reverse (15201212120102), we get a palindrome (35303333330353).

The spelling of 20102121210251 in words is "twenty trillion, one hundred two billion, one hundred twenty-one million, two hundred ten thousand, two hundred fifty-one".