20211002443 has 4 divisors (see below), whose sum is σ = 20246901768. Its totient is φ = 20175103120.

The previous prime is 20211002429. The next prime is 20211002447. The reversal of 20211002443 is 34420011202.

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 20211002443 - 2²¹ = 20208905291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211002443.

It is not an unprimeable number, because it can be changed into a prime (20211002447) 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, 17948818 + ... + 17949943.

It is an arithmetic number, because the mean of its divisors is an integer number (5061725442).

Almost surely, 2^20211002443 is an apocalyptic number.

20211002443 is a deficient number, since it is larger than the sum of its proper divisors (35899325).

20211002443 is an equidigital number, since it uses as much as digits as its factorization.

20211002443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35899324.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20211002443 its reverse (34420011202), we get a palindrome (54631013645).

The spelling of 20211002443 in words is "twenty billion, two hundred eleven million, two thousand, four hundred forty-three".