221201001200 has 60 divisors (see below), whose sum is σ = 562696328880. Its totient is φ = 83275668480.

The previous prime is 221201001187. The next prime is 221201001283. The reversal of 221201001200 is 2100102122.

It is a happy number.

It is a congruent 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, 16257980 + ... + 16271579.

It is an arithmetic number, because the mean of its divisors is an integer number (9378272148).

Almost surely, 2^221201001200 is an apocalyptic number.

221201001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201001200 is an abundant number, since it is smaller than the sum of its proper divisors (341495327680).

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

221201001200 is a wasteful number, since it uses less digits than its factorization.

221201001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32529594 (or 32529583 counting only the distinct ones).

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

Adding to 221201001200 its reverse (2100102122), we get a palindrome (223301103322).

The spelling of 221201001200 in words is "two hundred twenty-one billion, two hundred one million, one thousand, two hundred".