1221210012200 has 24 divisors (see below), whose sum is σ = 2839313278830. Its totient is φ = 488484004800.

The previous prime is 1221210012181. The next prime is 1221210012223. The reversal of 1221210012200 is 22100121221.

It can be written as a sum of positive squares in 3 ways, for example, as 1172659415236 + 48550596964 = 1082894^2 + 220342^2 .

It is a super-3 number, since 3×1221210012200³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3053024831 + ... + 3053025230.

Almost surely, 2^{1221210012200} is an apocalyptic number.

1221210012200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221210012200 is an abundant number, since it is smaller than the sum of its proper divisors (1618103266630).

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

1221210012200 is a wasteful number, since it uses less digits than its factorization.

1221210012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106050077 (or 6106050068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221210012200 its reverse (22100121221), we get a palindrome (1243310133421).

The spelling of 1221210012200 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, twelve thousand, two hundred".