21401024424 has 64 divisors (see below), whose sum is σ = 57936627840. Its totient is φ = 6548532480.

The previous prime is 21401024401. The next prime is 21401024467. The reversal of 21401024424 is 42442010412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21401024394 and 21401024403.

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, 133012 + ... + 245955.

It is an arithmetic number, because the mean of its divisors is an integer number (905259810).

Almost surely, 2^21401024424 is an apocalyptic number.

21401024424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21401024424 is an abundant number, since it is smaller than the sum of its proper divisors (36535603416).

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

21401024424 is a wasteful number, since it uses less digits than its factorization.

21401024424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379170 (or 379166 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21401024424 its reverse (42442010412), we get a palindrome (63843034836).

The spelling of 21401024424 in words is "twenty-one billion, four hundred one million, twenty-four thousand, four hundred twenty-four".