21303120020 has 96 divisors (see below), whose sum is σ = 56836663296. Its totient is φ = 6524582400.

The previous prime is 21303119987. The next prime is 21303120043. The reversal of 21303120020 is 2002130312.

It is a happy number.

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 = 21303119977 and 21303120004.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 132371 + ... + 245210.

It is an arithmetic number, because the mean of its divisors is an integer number (592048576).

Almost surely, 2^21303120020 is an apocalyptic number.

21303120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303120020 is an abundant number, since it is smaller than the sum of its proper divisors (35533543276).

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

21303120020 is a wasteful number, since it uses less digits than its factorization.

21303120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377641 (or 377639 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21303120020 its reverse (2002130312), we get a palindrome (23305250332).

The spelling of 21303120020 in words is "twenty-one billion, three hundred three million, one hundred twenty thousand, twenty".