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201100000021 = 242238302027
BaseRepresentation
bin1011101101001001111…
…1100111101100010101
3201020002000010110211221
42323102133213230111
511243323100000041
6232214542530341
720346305540104
oct2732237475425
9636060113757
10201100000021
1178316786528
1232b83b969b1
1315c6b19cb6b
149a3a22003b
15536ed0a2d1
hex2ed27e7b15

201100000021 has 4 divisors (see below), whose sum is σ = 201108326272. Its totient is φ = 201091673772.

The previous prime is 201100000001. The next prime is 201100000027. The reversal of 201100000021 is 120000001102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-201100000021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201100000027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4126791 + ... + 4175236.

It is an arithmetic number, because the mean of its divisors is an integer number (50277081568).

Almost surely, 2201100000021 is an apocalyptic number.

It is an amenable number.

201100000021 is a deficient number, since it is larger than the sum of its proper divisors (8326251).

201100000021 is an equidigital number, since it uses as much as digits as its factorization.

201100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8326250.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 201100000021 its reverse (120000001102), we get a palindrome (321100001123).

The spelling of 201100000021 in words is "two hundred one billion, one hundred million, twenty-one", and thus it is an aban number.

Divisors: 1 24223 8302027 201100000021