21212333300 has 36 divisors (see below), whose sum is σ = 46094237280. Its totient is φ = 8473233120.

The previous prime is 21212333293. The next prime is 21212333341. The reversal of 21212333300 is 333321212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 73190 + ... + 218589.

It is an arithmetic number, because the mean of its divisors is an integer number (1280395480).

Almost surely, 2^21212333300 is an apocalyptic number.

21212333300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212333300 is an abundant number, since it is smaller than the sum of its proper divisors (24881903980).

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

21212333300 is a wasteful number, since it uses less digits than its factorization.

21212333300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292520 (or 292513 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21212333300 its reverse (333321212), we get a palindrome (21545654512).

The spelling of 21212333300 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-three thousand, three hundred".