21120084711 has 24 divisors (see below), whose sum is σ = 33298156944. Its totient is φ = 12793119360.

The previous prime is 21120084679. The next prime is 21120084743. The reversal of 21120084711 is 11748002112.

It is an interprime number because it is at equal distance from previous prime (21120084679) and next prime (21120084743).

It is not a de Polignac number, because 21120084711 - 2⁵ = 21120084679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120084511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128995 + ... + 242651.

It is an arithmetic number, because the mean of its divisors is an integer number (1387423206).

Almost surely, 2^21120084711 is an apocalyptic number.

21120084711 is a deficient number, since it is larger than the sum of its proper divisors (12178072233).

21120084711 is a wasteful number, since it uses less digits than its factorization.

21120084711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115551 (or 115548 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

Adding to 21120084711 its reverse (11748002112), we get a palindrome (32868086823).

The spelling of 21120084711 in words is "twenty-one billion, one hundred twenty million, eighty-four thousand, seven hundred eleven".