2101221200987 has 2 divisors, whose sum is σ = 2101221200988. Its totient is φ = 2101221200986.

The previous prime is 2101221200927. The next prime is 2101221201043. The reversal of 2101221200987 is 7890021221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101221200987 - 2¹⁶ = 2101221135451 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101221200927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050610600493 + 1050610600494.

It is an arithmetic number, because the mean of its divisors is an integer number (1050610600494).

Almost surely, 2^{2101221200987} is an apocalyptic number.

2101221200987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101221200987 is an equidigital number, since it uses as much as digits as its factorization.

2101221200987 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2101221200987 its reverse (7890021221012), we get a palindrome (9991242421999).

The spelling of 2101221200987 in words is "two trillion, one hundred one billion, two hundred twenty-one million, two hundred thousand, nine hundred eighty-seven".