21200002121200 has 60 divisors (see below), whose sum is σ = 58209148689040. Its totient is φ = 7268572154880.

The previous prime is 21200002121173. The next prime is 21200002121227. The reversal of 21200002121200 is 212120000212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21200002121173) and next prime (21200002121227).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3785711865 + ... + 3785717464.

Almost surely, 2^{21200002121200} is an apocalyptic number.

21200002121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200002121200 is an abundant number, since it is smaller than the sum of its proper divisors (37009146567840).

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

21200002121200 is a wasteful number, since it uses less digits than its factorization.

21200002121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7571429354 (or 7571429343 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200002121200 its reverse (212120000212), we get a palindrome (21412122121412).

The spelling of 21200002121200 in words is "twenty-one trillion, two hundred billion, two million, one hundred twenty-one thousand, two hundred".