20101101221251 has 2 divisors, whose sum is σ = 20101101221252. Its totient is φ = 20101101221250.

The previous prime is 20101101221161. The next prime is 20101101221273. The reversal of 20101101221251 is 15212210110102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101101221251 is a prime.

It is not a weakly prime, because it can be changed into another prime (20101101221291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050550610625 + 10050550610626.

It is an arithmetic number, because the mean of its divisors is an integer number (10050550610626).

Almost surely, 2^{20101101221251} is an apocalyptic number.

20101101221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101101221251 is an equidigital number, since it uses as much as digits as its factorization.

20101101221251 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 20101101221251 its reverse (15212210110102), we get a palindrome (35313311331353).

The spelling of 20101101221251 in words is "twenty trillion, one hundred one billion, one hundred one million, two hundred twenty-one thousand, two hundred fifty-one".