21210123403300 has 36 divisors (see below), whose sum is σ = 49566426848596. Its totient is φ = 7831430179200.

The previous prime is 21210123403267. The next prime is 21210123403303. The reversal of 21210123403300 is 330432101212.

It can be written as a sum of positive squares in 6 ways, for example, as 1818765115456 + 19391358287844 = 1348616^2 + 4403562^2 .

It is not an unprimeable number, because it can be changed into a prime (21210123403303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8157738471 + ... + 8157741070.

Almost surely, 2^{21210123403300} is an apocalyptic number.

21210123403300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210123403300 is an abundant number, since it is smaller than the sum of its proper divisors (28356303445296).

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

21210123403300 is a wasteful number, since it uses less digits than its factorization.

21210123403300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16315479568 (or 16315479561 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21210123403300 its reverse (330432101212), we get a palindrome (21540555504512).

The spelling of 21210123403300 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-three million, four hundred three thousand, three hundred".