21020120300 has 18 divisors (see below), whose sum is σ = 45613661268. Its totient is φ = 8408048080.

The previous prime is 21020120243. The next prime is 21020120327. The reversal of 21020120300 is 302102012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105100502 + ... + 105100701.

Almost surely, 2^21020120300 is an apocalyptic number.

21020120300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020120300 is an abundant number, since it is smaller than the sum of its proper divisors (24593540968).

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

21020120300 is a wasteful number, since it uses less digits than its factorization.

21020120300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210201217 (or 210201210 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21020120300 its reverse (302102012), we get a palindrome (21322222312).

The spelling of 21020120300 in words is "twenty-one billion, twenty million, one hundred twenty thousand, three hundred".