2101001221987 has 8 divisors (see below), whose sum is σ = 2116985920704. Its totient is φ = 2085054268968.

The previous prime is 2101001221981. The next prime is 2101001221999. The reversal of 2101001221987 is 7891221001012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101001221987 - 2¹¹ = 2101001219939 is a prime.

It is a super-2 number, since 2×2101001221987² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101001221981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9324673 + ... + 9547330.

It is an arithmetic number, because the mean of its divisors is an integer number (264623240088).

Almost surely, 2^{2101001221987} is an apocalyptic number.

2101001221987 is a deficient number, since it is larger than the sum of its proper divisors (15984698717).

2101001221987 is a wasteful number, since it uses less digits than its factorization.

2101001221987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18872849.

The product of its (nonzero) digits is 4032, while the sum is 34.

Adding to 2101001221987 its reverse (7891221001012), we get a palindrome (9992222222999).

The spelling of 2101001221987 in words is "two trillion, one hundred one billion, one million, two hundred twenty-one thousand, nine hundred eighty-seven".