2021021101987 has 4 divisors (see below), whose sum is σ = 2021050367856. Its totient is φ = 2020991836120.

The previous prime is 2021021101951. The next prime is 2021021101993. The reversal of 2021021101987 is 7891011201202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021021101987 - 2¹⁹ = 2021020577699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021021161987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14529103 + ... + 14667544.

It is an arithmetic number, because the mean of its divisors is an integer number (505262591964).

Almost surely, 2^{2021021101987} is an apocalyptic number.

2021021101987 is a deficient number, since it is larger than the sum of its proper divisors (29265869).

2021021101987 is an equidigital number, since it uses as much as digits as its factorization.

2021021101987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29265868.

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

The spelling of 2021021101987 in words is "two trillion, twenty-one billion, twenty-one million, one hundred one thousand, nine hundred eighty-seven".