21000300030 has 32 divisors (see below), whose sum is σ = 56000800800. Its totient is φ = 5600079936.

The previous prime is 21000300007. The next prime is 21000300089. The reversal of 21000300030 is 3000300012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

21000300030 is a modest number, since divided by 300030 gives 210 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21000299985 and 21000300021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38889175 + ... + 38889714.

It is an arithmetic number, because the mean of its divisors is an integer number (1750025025).

Almost surely, 2^21000300030 is an apocalyptic number.

21000300030 is an abundant number, since it is smaller than the sum of its proper divisors (35000500770).

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

21000300030 is a wasteful number, since it uses less digits than its factorization.

21000300030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778905 (or 77778899 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

Subtracting from 21000300030 its product of nonzero digits (18), we obtain a palindrome (21000300012).

Adding to 21000300030 its reverse (3000300012), we get a palindrome (24000600042).

The spelling of 21000300030 in words is "twenty-one billion, three hundred thousand, thirty".