21155020300 has 36 divisors (see below), whose sum is σ = 45976197960. Its totient is φ = 8449141120.

The previous prime is 21155020283. The next prime is 21155020319. The reversal of 21155020300 is 302055112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94609 + ... + 226408.

It is an arithmetic number, because the mean of its divisors is an integer number (1277116610).

Almost surely, 2^21155020300 is an apocalyptic number.

21155020300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21155020300 is an abundant number, since it is smaller than the sum of its proper divisors (24821177660).

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

21155020300 is a wasteful number, since it uses less digits than its factorization.

21155020300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321690 (or 321683 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 21155020300 its reverse (302055112), we get a palindrome (21457075412).

The spelling of 21155020300 in words is "twenty-one billion, one hundred fifty-five million, twenty thousand, three hundred".