201021001200 has 90 divisors (see below), whose sum is σ = 697598725824. Its totient is φ = 53605599360.

The previous prime is 201021001177. The next prime is 201021001229. The reversal of 201021001200 is 2100120102.

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, 27915984 + ... + 27923183.

Almost surely, 2^201021001200 is an apocalyptic number.

201021001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021001200 is an abundant number, since it is smaller than the sum of its proper divisors (496577724624).

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

201021001200 is a wasteful number, since it uses less digits than its factorization.

201021001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55839191 (or 55839177 counting only the distinct ones).

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

Adding to 201021001200 its reverse (2100120102), we get a palindrome (203121121302).

The spelling of 201021001200 in words is "two hundred one billion, twenty-one million, one thousand, two hundred".