21212303300 has 18 divisors (see below), whose sum is σ = 46030698378. Its totient is φ = 8484921280.

The previous prime is 21212303269. The next prime is 21212303303. The reversal of 21212303300 is 330321212.

It can be written as a sum of positive squares in 3 ways, for example, as 1120374784 + 20091928516 = 33472^2 + 141746^2 .

It is a super-2 number, since 2×21212303300² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212303303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106061417 + ... + 106061616.

It is an arithmetic number, because the mean of its divisors is an integer number (2557261021).

Almost surely, 2^21212303300 is an apocalyptic number.

21212303300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212303300 is an abundant number, since it is smaller than the sum of its proper divisors (24818395078).

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

21212303300 is a wasteful number, since it uses less digits than its factorization.

21212303300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212123047 (or 212123040 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21212303300 its reverse (330321212), we get a palindrome (21542624512).

The spelling of 21212303300 in words is "twenty-one billion, two hundred twelve million, three hundred three thousand, three hundred".