201021102187 has 2 divisors, whose sum is σ = 201021102188. Its totient is φ = 201021102186.

The previous prime is 201021102103. The next prime is 201021102199. The reversal of 201021102187 is 781201120102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201021102187 - 2¹⁹ = 201020577899 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021102487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510551093 + 100510551094.

It is an arithmetic number, because the mean of its divisors is an integer number (100510551094).

Almost surely, 2^201021102187 is an apocalyptic number.

201021102187 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021102187 is an equidigital number, since it uses as much as digits as its factorization.

201021102187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 201021102187 its reverse (781201120102), we get a palindrome (982222222289).

The spelling of 201021102187 in words is "two hundred one billion, twenty-one million, one hundred two thousand, one hundred eighty-seven".