21120111212147 has 2 divisors, whose sum is σ = 21120111212148. Its totient is φ = 21120111212146.

The previous prime is 21120111212059. The next prime is 21120111212177. The reversal of 21120111212147 is 74121211102112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120111212147 - 2¹⁰ = 21120111211123 is a prime.

It is a super-2 number, since 2×21120111212147² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120111212177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560055606073 + 10560055606074.

It is an arithmetic number, because the mean of its divisors is an integer number (10560055606074).

Almost surely, 2^{21120111212147} is an apocalyptic number.

21120111212147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120111212147 is an equidigital number, since it uses as much as digits as its factorization.

21120111212147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 21120111212147 its reverse (74121211102112), we get a palindrome (95241322314259).

The spelling of 21120111212147 in words is "twenty-one trillion, one hundred twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred forty-seven".