20101221112187 has 2 divisors, whose sum is σ = 20101221112188. Its totient is φ = 20101221112186.

The previous prime is 20101221112121. The next prime is 20101221112211. The reversal of 20101221112187 is 78121112210102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20101221112187 - 2¹⁰ = 20101221111163 is a prime.

It is not a weakly prime, because it can be changed into another prime (20101224112187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050610556093 + 10050610556094.

It is an arithmetic number, because the mean of its divisors is an integer number (10050610556094).

Almost surely, 2^{20101221112187} is an apocalyptic number.

20101221112187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101221112187 is an equidigital number, since it uses as much as digits as its factorization.

20101221112187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 29.

Adding to 20101221112187 its reverse (78121112210102), we get a palindrome (98222333322289).

The spelling of 20101221112187 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eighty-seven".