20121001200 has 90 divisors (see below), whose sum is σ = 69825475824. Its totient is φ = 5365599360.

The previous prime is 20121001189. The next prime is 20121001231. The reversal of 20121001200 is 210012102.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2790984 + ... + 2798183.

Almost surely, 2^20121001200 is an apocalyptic number.

20121001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121001200 is an abundant number, since it is smaller than the sum of its proper divisors (49704474624).

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

20121001200 is a wasteful number, since it uses less digits than its factorization.

20121001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589191 (or 5589177 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20121001200 its reverse (210012102), we get a palindrome (20331013302).

The spelling of 20121001200 in words is "twenty billion, one hundred twenty-one million, one thousand, two hundred".