20031211801 has 2 divisors, whose sum is σ = 20031211802. Its totient is φ = 20031211800.

The previous prime is 20031211799. The next prime is 20031211807. The reversal of 20031211801 is 10811213002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18638802576 + 1392409225 = 136524^2 + 37315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031211801 - 2¹ = 20031211799 is a prime.

Together with 20031211799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20031211807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015605900 + 10015605901.

It is an arithmetic number, because the mean of its divisors is an integer number (10015605901).

Almost surely, 2^20031211801 is an apocalyptic number.

It is an amenable number.

20031211801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031211801 is an equidigital number, since it uses as much as digits as its factorization.

20031211801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20031211801 its reverse (10811213002), we get a palindrome (30842424803).

The spelling of 20031211801 in words is "twenty billion, thirty-one million, two hundred eleven thousand, eight hundred one".