21373411 has 2 divisors, whose sum is σ = 21373412. Its totient is φ = 21373410.

The previous prime is 21373409. The next prime is 21373447. The reversal of 21373411 is 11437312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21373411 - 2¹ = 21373409 is a prime.

Together with 21373409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21373111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686705 + 10686706.

It is an arithmetic number, because the mean of its divisors is an integer number (10686706).

Almost surely, 2^21373411 is an apocalyptic number.

21373411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373411 is an equidigital number, since it uses as much as digits as its factorization.

21373411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 21373411 is about 4623.1386524741. The cubic root of 21373411 is about 277.5180779825.

The spelling of 21373411 in words is "twenty-one million, three hundred seventy-three thousand, four hundred eleven".