21213033300 has 90 divisors (see below), whose sum is σ = 68764299758. Its totient is φ = 5656806720.

The previous prime is 21213033277. The next prime is 21213033301. The reversal of 21213033300 is 333031212.

It can be written as a sum of positive squares in 3 ways, for example, as 4981254084 + 16231779216 = 70578^2 + 127404^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213033301) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1301347 + ... + 1317546.

Almost surely, 2^21213033300 is an apocalyptic number.

21213033300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213033300 is an abundant number, since it is smaller than the sum of its proper divisors (47551266458).

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

21213033300 is a wasteful number, since it uses less digits than its factorization.

21213033300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618919 (or 2618903 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21213033300 its reverse (333031212), we get a palindrome (21546064512).

The spelling of 21213033300 in words is "twenty-one billion, two hundred thirteen million, thirty-three thousand, three hundred".