20400244211 has 2 divisors, whose sum is σ = 20400244212. Its totient is φ = 20400244210.

The previous prime is 20400244201. The next prime is 20400244223. The reversal of 20400244211 is 11244200402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400244211 - 2⁶ = 20400244147 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20400244201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200122105 + 10200122106.

It is an arithmetic number, because the mean of its divisors is an integer number (10200122106).

Almost surely, 2^20400244211 is an apocalyptic number.

20400244211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400244211 is an equidigital number, since it uses as much as digits as its factorization.

20400244211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20400244211 its reverse (11244200402), we get a palindrome (31644444613).

The spelling of 20400244211 in words is "twenty billion, four hundred million, two hundred forty-four thousand, two hundred eleven".