21000022411 has 2 divisors, whose sum is σ = 21000022412. Its totient is φ = 21000022410.

The previous prime is 21000022409. The next prime is 21000022487. The reversal of 21000022411 is 11422000012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000022411 - 2¹ = 21000022409 is a prime.

Together with 21000022409, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21000022391 and 21000022400.

It is not a weakly prime, because it can be changed into another prime (21000022811) 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, 10500011205 + 10500011206.

It is an arithmetic number, because the mean of its divisors is an integer number (10500011206).

Almost surely, 2^21000022411 is an apocalyptic number.

21000022411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000022411 is an equidigital number, since it uses as much as digits as its factorization.

21000022411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000022411 its reverse (11422000012), we get a palindrome (32422022423).

The spelling of 21000022411 in words is "twenty-one billion, twenty-two thousand, four hundred eleven".