21200201201987 has 2 divisors, whose sum is σ = 21200201201988. Its totient is φ = 21200201201986.

The previous prime is 21200201201983. The next prime is 21200201202001. The reversal of 21200201201987 is 78910210200212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200201201987 - 2² = 21200201201983 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200201201983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600100600993 + 10600100600994.

It is an arithmetic number, because the mean of its divisors is an integer number (10600100600994).

Almost surely, 2^{21200201201987} is an apocalyptic number.

21200201201987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200201201987 is an equidigital number, since it uses as much as digits as its factorization.

21200201201987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 21200201201987 in words is "twenty-one trillion, two hundred billion, two hundred one million, two hundred one thousand, nine hundred eighty-seven".