21040020311 has 2 divisors, whose sum is σ = 21040020312. Its totient is φ = 21040020310.

The previous prime is 21040020283. The next prime is 21040020319. The reversal of 21040020311 is 11302004012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21040020311 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040020319) 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 as a sum of consecutive naturals, namely, 10520010155 + 10520010156.

It is an arithmetic number, because the mean of its divisors is an integer number (10520010156).

Almost surely, 2^21040020311 is an apocalyptic number.

21040020311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040020311 is an equidigital number, since it uses as much as digits as its factorization.

21040020311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21040020311 its reverse (11302004012), we get a palindrome (32342024323).

The spelling of 21040020311 in words is "twenty-one billion, forty million, twenty thousand, three hundred eleven".