21113112124 has 48 divisors (see below), whose sum is σ = 43269424128. Its totient is φ = 8923419648.

The previous prime is 21113112019. The next prime is 21113112143. The reversal of 21113112124 is 42121131112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290044 + ... + 355459.

It is an arithmetic number, because the mean of its divisors is an integer number (901446336).

Almost surely, 2^21113112124 is an apocalyptic number.

It is an amenable number.

21113112124 is an abundant number, since it is smaller than the sum of its proper divisors (22156312004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113112124 is a wasteful number, since it uses less digits than its factorization.

21113112124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645574 (or 645572 counting only the distinct ones).

The product of its digits is 96, while the sum is 19.

Adding to 21113112124 its reverse (42121131112), we get a palindrome (63234243236).

The spelling of 21113112124 in words is "twenty-one billion, one hundred thirteen million, one hundred twelve thousand, one hundred twenty-four".