21212233100 has 36 divisors (see below), whose sum is σ = 46187710464. Its totient is φ = 8455922880.

The previous prime is 21212233093. The next prime is 21212233109. The reversal of 21212233100 is 133221212.

It is a super-2 number, since 2×21212233100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212233109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332684 + ... + 391283.

Almost surely, 2^21212233100 is an apocalyptic number.

21212233100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212233100 is an abundant number, since it is smaller than the sum of its proper divisors (24975477364).

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

21212233100 is a wasteful number, since it uses less digits than its factorization.

21212233100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724274 (or 724267 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21212233100 its reverse (133221212), we get a palindrome (21345454312).

The spelling of 21212233100 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-three thousand, one hundred".