20211111247 has 2 divisors, whose sum is σ = 20211111248. Its totient is φ = 20211111246.

The previous prime is 20211111211. The next prime is 20211111257. The reversal of 20211111247 is 74211111202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211111247 - 2²⁷ = 20076893519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211111257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105555623 + 10105555624.

It is an arithmetic number, because the mean of its divisors is an integer number (10105555624).

Almost surely, 2^20211111247 is an apocalyptic number.

20211111247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211111247 is an equidigital number, since it uses as much as digits as its factorization.

20211111247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 20211111247 its reverse (74211111202), we get a palindrome (94422222449).

The spelling of 20211111247 in words is "twenty billion, two hundred eleven million, one hundred eleven thousand, two hundred forty-seven".