21024412404420 has 96 divisors (see below), whose sum is σ = 59132535436800. Its totient is φ = 5581403633664.

The previous prime is 21024412404403. The next prime is 21024412404421. The reversal of 21024412404420 is 2440421442012.

It is a super-2 number, since 2×21024412404420² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21024412404421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11690376 + ... + 13368384.

It is an arithmetic number, because the mean of its divisors is an integer number (615963910800).

Almost surely, 2^{21024412404420} is an apocalyptic number.

21024412404420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024412404420 is an abundant number, since it is smaller than the sum of its proper divisors (38108123032380).

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

21024412404420 is a wasteful number, since it uses less digits than its factorization.

21024412404420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678957 (or 1678955 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 21024412404420 its reverse (2440421442012), we get a palindrome (23464833846432).

The spelling of 21024412404420 in words is "twenty-one trillion, twenty-four billion, four hundred twelve million, four hundred four thousand, four hundred twenty".