21033342020 has 12 divisors (see below), whose sum is σ = 44170018284. Its totient is φ = 8413336800.

The previous prime is 21033342017. The next prime is 21033342047. The reversal of 21033342020 is 2024333012.

It can be written as a sum of positive squares in 2 ways, for example, as 12201853444 + 8831488576 = 110462^2 + 93976^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1051667101 = 21033342020 / (2 + 1 + 0 + 3 + 3 + 3 + 4 + 2 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21033341983 and 21033342001.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 525833531 + ... + 525833570.

It is an arithmetic number, because the mean of its divisors is an integer number (3680834857).

Almost surely, 2^21033342020 is an apocalyptic number.

21033342020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033342020 is an abundant number, since it is smaller than the sum of its proper divisors (23136676264).

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

21033342020 is a wasteful number, since it uses less digits than its factorization.

21033342020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051667110 (or 1051667108 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21033342020 its reverse (2024333012), we get a palindrome (23057675032).

The spelling of 21033342020 in words is "twenty-one billion, thirty-three million, three hundred forty-two thousand, twenty".