20211011243 has 4 divisors (see below), whose sum is σ = 20268922800. Its totient is φ = 20153099688.

The previous prime is 20211011147. The next prime is 20211011257. The reversal of 20211011243 is 34211011202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34211011202 = 2 ⋅17105505601.

It is a cyclic number.

It is not a de Polignac number, because 20211011243 - 2⁸ = 20211010987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211011143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28955255 + ... + 28955952.

It is an arithmetic number, because the mean of its divisors is an integer number (5067230700).

Almost surely, 2^20211011243 is an apocalyptic number.

20211011243 is a deficient number, since it is larger than the sum of its proper divisors (57911557).

20211011243 is an equidigital number, since it uses as much as digits as its factorization.

20211011243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57911556.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20211011243 its reverse (34211011202), we get a palindrome (54422022445).

The spelling of 20211011243 in words is "twenty billion, two hundred eleven million, eleven thousand, two hundred forty-three".