21212202200 has 192 divisors, whose sum is σ = 59808404160. Its totient is φ = 6830161920.

The previous prime is 21212202173. The next prime is 21212202227. The reversal of 21212202200 is 220221212.

It is an interprime number because it is at equal distance from previous prime (21212202173) and next prime (21212202227).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18396824 + ... + 18397976.

It is an arithmetic number, because the mean of its divisors is an integer number (311502105).

Almost surely, 2^21212202200 is an apocalyptic number.

21212202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212202200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29904202080).

21212202200 is an abundant number, since it is smaller than the sum of its proper divisors (38596201960).

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

21212202200 is a wasteful number, since it uses less digits than its factorization.

21212202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21212202200 its reverse (220221212), we get a palindrome (21432423412).

The spelling of 21212202200 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred".