20001200221200 has 120 divisors (see below), whose sum is σ = 69895103364576. Its totient is φ = 4848775808000.

The previous prime is 20001200221181. The next prime is 20001200221231. The reversal of 20001200221200 is 212200210002.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 757608021 + ... + 757634420.

Almost surely, 2^{20001200221200} is an apocalyptic number.

20001200221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001200221200 is an abundant number, since it is smaller than the sum of its proper divisors (49893903143376).

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

20001200221200 is a wasteful number, since it uses less digits than its factorization.

20001200221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515242473 (or 1515242462 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001200221200 its reverse (212200210002), we get a palindrome (20213400431202).

The spelling of 20001200221200 in words is "twenty trillion, one billion, two hundred million, two hundred twenty-one thousand, two hundred".