20211211117 has 2 divisors, whose sum is σ = 20211211118. Its totient is φ = 20211211116.

The previous prime is 20211211109. The next prime is 20211211121. The reversal of 20211211117 is 71111211202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19241573796 + 969637321 = 138714^2 + 31139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211211117 - 2³ = 20211211109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211211094 and 20211211103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211211127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105605558 + 10105605559.

It is an arithmetic number, because the mean of its divisors is an integer number (10105605559).

Almost surely, 2^20211211117 is an apocalyptic number.

It is an amenable number.

20211211117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211211117 is an equidigital number, since it uses as much as digits as its factorization.

20211211117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 20211211117 its reverse (71111211202), we get a palindrome (91322422319).

The spelling of 20211211117 in words is "twenty billion, two hundred eleven million, two hundred eleven thousand, one hundred seventeen".