2102102111251 has 2 divisors, whose sum is σ = 2102102111252. Its totient is φ = 2102102111250.

The previous prime is 2102102111243. The next prime is 2102102111269. The reversal of 2102102111251 is 1521112012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2102102111251 - 2³ = 2102102111243 is a prime.

It is a super-2 number, since 2×2102102111251² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2102102111951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051051055625 + 1051051055626.

It is an arithmetic number, because the mean of its divisors is an integer number (1051051055626).

Almost surely, 2^{2102102111251} is an apocalyptic number.

2102102111251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102102111251 is an equidigital number, since it uses as much as digits as its factorization.

2102102111251 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 19.

Adding to 2102102111251 its reverse (1521112012012), we get a palindrome (3623214123263).

The spelling of 2102102111251 in words is "two trillion, one hundred two billion, one hundred two million, one hundred eleven thousand, two hundred fifty-one".