21434024020 has 12 divisors (see below), whose sum is σ = 45011450484. Its totient is φ = 8573609600.

The previous prime is 21434024009. The next prime is 21434024021. The reversal of 21434024020 is 2042043412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6474777156 + 14959246864 = 80466^2 + 122308^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21434023982 and 21434024000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434024021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535850581 + ... + 535850620.

It is an arithmetic number, because the mean of its divisors is an integer number (3750954207).

Almost surely, 2^21434024020 is an apocalyptic number.

21434024020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434024020 is an abundant number, since it is smaller than the sum of its proper divisors (23577426464).

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

21434024020 is a wasteful number, since it uses less digits than its factorization.

21434024020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071701210 (or 1071701208 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21434024020 its reverse (2042043412), we get a palindrome (23476067432).

The spelling of 21434024020 in words is "twenty-one billion, four hundred thirty-four million, twenty-four thousand, twenty".