20211001243 has 2 divisors, whose sum is σ = 20211001244. Its totient is φ = 20211001242.

The previous prime is 20211001201. The next prime is 20211001247. The reversal of 20211001243 is 34210011202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211001243 - 2¹³ = 20210993051 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211001247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105500621 + 10105500622.

It is an arithmetic number, because the mean of its divisors is an integer number (10105500622).

Almost surely, 2^20211001243 is an apocalyptic number.

20211001243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211001243 is an equidigital number, since it uses as much as digits as its factorization.

20211001243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20211001243 its reverse (34210011202), we get a palindrome (54421012445).

The spelling of 20211001243 in words is "twenty billion, two hundred eleven million, one thousand, two hundred forty-three".