21404333411 has 2 divisors, whose sum is σ = 21404333412. Its totient is φ = 21404333410.

The previous prime is 21404333399. The next prime is 21404333437. The reversal of 21404333411 is 11433340412.

It is a happy number.

It is an a-pointer prime, because the next prime (21404333437) can be obtained adding 21404333411 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404333411 - 2³⁰ = 20330591587 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404333441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702166705 + 10702166706.

It is an arithmetic number, because the mean of its divisors is an integer number (10702166706).

Almost surely, 2^21404333411 is an apocalyptic number.

21404333411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404333411 is an equidigital number, since it uses as much as digits as its factorization.

21404333411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21404333411 its reverse (11433340412), we get a palindrome (32837673823).

The spelling of 21404333411 in words is "twenty-one billion, four hundred four million, three hundred thirty-three thousand, four hundred eleven".