21003303020 has 24 divisors (see below), whose sum is σ = 50407927584. Its totient is φ = 7201132416.

The previous prime is 21003302959. The next prime is 21003303049. The reversal of 21003303020 is 2030330012.

It is a super-2 number, since 2×21003303020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21003302986 and 21003303004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75011657 + ... + 75011936.

It is an arithmetic number, because the mean of its divisors is an integer number (2100330316).

Almost surely, 2^21003303020 is an apocalyptic number.

21003303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003303020 is an abundant number, since it is smaller than the sum of its proper divisors (29404624564).

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

21003303020 is a wasteful number, since it uses less digits than its factorization.

21003303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150023609 (or 150023607 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

Adding to 21003303020 its reverse (2030330012), we get a palindrome (23033633032).

The spelling of 21003303020 in words is "twenty-one billion, three million, three hundred three thousand, twenty".