200000100209981 has 2 divisors, whose sum is σ = 200000100209982. Its totient is φ = 200000100209980.

The previous prime is 200000100209963. The next prime is 200000100210013. The reversal of 200000100209981 is 189902001000002.

It is a happy number.

It is an a-pointer prime, because the next prime (200000100210013) can be obtained adding 200000100209981 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128921627261956 + 71078472948025 = 11354366^2 + 8430805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200000100209981 is a prime.

It is a super-2 number, since 2×200000100209981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200000100209281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100000050104990 + 100000050104991.

It is an arithmetic number, because the mean of its divisors is an integer number (100000050104991).

Almost surely, 2^{200000100209981} is an apocalyptic number.

It is an amenable number.

200000100209981 is a deficient number, since it is larger than the sum of its proper divisors (1).

200000100209981 is an equidigital number, since it uses as much as digits as its factorization.

200000100209981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

Adding to 200000100209981 its reverse (189902001000002), we get a palindrome (389902101209983).

The spelling of 200000100209981 in words is "two hundred trillion, one hundred million, two hundred nine thousand, nine hundred eighty-one".