11000020019971 has 2 divisors, whose sum is σ = 11000020019972. Its totient is φ = 11000020019970.

The previous prime is 11000020019917. The next prime is 11000020019981. The reversal of 11000020019971 is 17991002000011.

It is a happy number.

Together with previous prime (11000020019917) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (17991002000011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11000020019971 - 2⁴¹ = 8800996764419 is a prime.

It is not a weakly prime, because it can be changed into another prime (11000020019981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500010009985 + 5500010009986.

It is an arithmetic number, because the mean of its divisors is an integer number (5500010009986).

Almost surely, 2^{11000020019971} is an apocalyptic number.

11000020019971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11000020019971 is an equidigital number, since it uses as much as digits as its factorization.

11000020019971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 31.

Adding to 11000020019971 its reverse (17991002000011), we get a palindrome (28991022019982).

The spelling of 11000020019971 in words is "eleven trillion, twenty million, nineteen thousand, nine hundred seventy-one".