2100021001200 has 150 divisors (see below), whose sum is σ = 7536806969384. Its totient is φ = 560005591680.

The previous prime is 2100021001189. The next prime is 2100021001213. The reversal of 2100021001200 is 21001200012.

It is a tau number, because it is divible by the number of its divisors (150).

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 29 ways as a sum of consecutive naturals, for example, 32375332 + ... + 32440131.

Almost surely, 2^{2100021001200} is an apocalyptic number.

2100021001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100021001200 is an abundant number, since it is smaller than the sum of its proper divisors (5436785968184).

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

2100021001200 is a wasteful number, since it uses less digits than its factorization.

2100021001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64815493 (or 64815473 counting only the distinct ones).

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

Adding to 2100021001200 its reverse (21001200012), we get a palindrome (2121022201212).

The spelling of 2100021001200 in words is "two trillion, one hundred billion, twenty-one million, one thousand, two hundred".