21111011147 has 2 divisors, whose sum is σ = 21111011148. Its totient is φ = 21111011146.

The previous prime is 21111011107. The next prime is 21111011177. The reversal of 21111011147 is 74111011112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111011147 - 2²⁰ = 21109962571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111011107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555505573 + 10555505574.

It is an arithmetic number, because the mean of its divisors is an integer number (10555505574).

Almost surely, 2^21111011147 is an apocalyptic number.

21111011147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111011147 is an equidigital number, since it uses as much as digits as its factorization.

21111011147 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 20.

Adding to 21111011147 its reverse (74111011112), we get a palindrome (95222022259).

The spelling of 21111011147 in words is "twenty-one billion, one hundred eleven million, eleven thousand, one hundred forty-seven".