21221002001200 has 60 divisors (see below), whose sum is σ = 51225085271368. Its totient is φ = 8448171379200.

The previous prime is 21221002001149. The next prime is 21221002001291. The reversal of 21221002001200 is 210020012212.

It is a happy number.

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, 125632437 + ... + 125801236.

Almost surely, 2^{21221002001200} is an apocalyptic number.

21221002001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221002001200 is an abundant number, since it is smaller than the sum of its proper divisors (30004083270168).

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

21221002001200 is a wasteful number, since it uses less digits than its factorization.

21221002001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251433902 (or 251433891 counting only the distinct ones).

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

Adding to 21221002001200 its reverse (210020012212), we get a palindrome (21431022013412).

The spelling of 21221002001200 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one thousand, two hundred".