21002103300 has 72 divisors (see below), whose sum is σ = 61912662336. Its totient is φ = 5494885760.

The previous prime is 21002103277. The next prime is 21002103341. The reversal of 21002103300 is 330120012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 644544 + ... + 676343.

It is an arithmetic number, because the mean of its divisors is an integer number (859898088).

Almost surely, 2^21002103300 is an apocalyptic number.

21002103300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002103300 is an abundant number, since it is smaller than the sum of its proper divisors (40910559036).

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

21002103300 is a wasteful number, since it uses less digits than its factorization.

21002103300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320957 (or 1320950 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21002103300 its reverse (330120012), we get a palindrome (21332223312).

The spelling of 21002103300 in words is "twenty-one billion, two million, one hundred three thousand, three hundred".