21212001000200 has 48 divisors (see below), whose sum is σ = 49318398667860. Its totient is φ = 8484715008000.

The previous prime is 21212001000181. The next prime is 21212001000217. The reversal of 21212001000200 is 200010021212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13804687597156 + 7407313403044 = 3715466^2 + 2721638^2 .

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, 21697940 + ... + 22654460.

Almost surely, 2^{21212001000200} is an apocalyptic number.

21212001000200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212001000200 is an abundant number, since it is smaller than the sum of its proper divisors (28106397667660).

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

21212001000200 is a wasteful number, since it uses less digits than its factorization.

21212001000200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067418 (or 1067409 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21212001000200 its reverse (200010021212), we get a palindrome (21412011021412).

The spelling of 21212001000200 in words is "twenty-one trillion, two hundred twelve billion, one million, two hundred", and thus it is an aban number.