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2101021200 = 243352227857

2101021200 has 240 divisors, whose sum is σ = 7519786560. Its totient is φ = 557153280.

The previous prime is 2101021193. The next prime is 2101021217. The reversal of 2101021200 is 21201012.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2451172 + ... + 2452028.

It is an arithmetic number, because the mean of its divisors is an integer number (31332444).

Almost surely, 22101021200 is an apocalyptic number.

2101021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3759893280).

2101021200 is an abundant number, since it is smaller than the sum of its proper divisors (5418765360).

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

2101021200 is a wasteful number, since it uses less digits than its factorization.

2101021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1094 counting only the distinct ones).

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

The square root of 2101021200 is about 45836.8978007893. The cubic root of 2101021200 is about 1280.7867071342.

Adding to 2101021200 its reverse (21201012), we get a palindrome (2122222212).

The spelling of 2101021200 in words is "two billion, one hundred one million, twenty-one thousand, two hundred".