2021530420211 has 4 divisors (see below), whose sum is σ = 2076166377552. Its totient is φ = 1966894462872.

The previous prime is 2021530420181. The next prime is 2021530420223. The reversal of 2021530420211 is 1120240351202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021530420211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021530420111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27317978615 + ... + 27317978688.

It is an arithmetic number, because the mean of its divisors is an integer number (519041594388).

Almost surely, 2^{2021530420211} is an apocalyptic number.

2021530420211 is a deficient number, since it is larger than the sum of its proper divisors (54635957341).

2021530420211 is an equidigital number, since it uses as much as digits as its factorization.

2021530420211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54635957340.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 2021530420211 its reverse (1120240351202), we get a palindrome (3141770771413).

The spelling of 2021530420211 in words is "two trillion, twenty-one billion, five hundred thirty million, four hundred twenty thousand, two hundred eleven".