21124120311 has 12 divisors (see below), whose sum is σ = 34871563792. Its totient is φ = 12070925856.

The previous prime is 21124120301. The next prime is 21124120351. The reversal of 21124120311 is 11302142112.

21124120311 is a `hidden beast` number, since 211 + 24 + 120 + 311 = 666.

It is not a de Polignac number, because 21124120311 - 2⁷ = 21124120183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124120301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167651686 + ... + 167651811.

Almost surely, 2^21124120311 is an apocalyptic number.

21124120311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21124120311 is a deficient number, since it is larger than the sum of its proper divisors (13747443481).

21124120311 is a wasteful number, since it uses less digits than its factorization.

21124120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335303510 (or 335303507 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21124120311 its reverse (11302142112), we get a palindrome (32426262423).

The spelling of 21124120311 in words is "twenty-one billion, one hundred twenty-four million, one hundred twenty thousand, three hundred eleven".