21101120424 has 96 divisors (see below), whose sum is σ = 60587005440. Its totient is φ = 6622819200.

The previous prime is 21101120399. The next prime is 21101120569. The reversal of 21101120424 is 42402110112.

21101120424 is a `hidden beast` number, since 21 + 101 + 120 + 424 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21101120397 and 21101120406.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45172 + ... + 210339.

It is an arithmetic number, because the mean of its divisors is an integer number (631114640).

Almost surely, 2^21101120424 is an apocalyptic number.

21101120424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21101120424 is an abundant number, since it is smaller than the sum of its proper divisors (39485885016).

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

21101120424 is a wasteful number, since it uses less digits than its factorization.

21101120424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255591 (or 255584 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21101120424 its reverse (42402110112), we get a palindrome (63503230536).

The spelling of 21101120424 in words is "twenty-one billion, one hundred one million, one hundred twenty thousand, four hundred twenty-four".