21034424020 has 48 divisors (see below), whose sum is σ = 46975073040. Its totient is φ = 7884232704.

The previous prime is 21034423997. The next prime is 21034424023. The reversal of 21034424020 is 2042443012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7683984 + 21026740036 = 2772^2 + 145006^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21034423982 and 21034424000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034424023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57219 + ... + 212938.

It is an arithmetic number, because the mean of its divisors is an integer number (978647355).

Almost surely, 2^21034424020 is an apocalyptic number.

21034424020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034424020 is an abundant number, since it is smaller than the sum of its proper divisors (25940649020).

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

21034424020 is a wasteful number, since it uses less digits than its factorization.

21034424020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270412 (or 270410 counting only the distinct ones).

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

Adding to 21034424020 its reverse (2042443012), we get a palindrome (23076867032).

The spelling of 21034424020 in words is "twenty-one billion, thirty-four million, four hundred twenty-four thousand, twenty".