21371359 has 2 divisors, whose sum is σ = 21371360. Its totient is φ = 21371358.

The previous prime is 21371341. The next prime is 21371377. The reversal of 21371359 is 95317312.

It is a balanced prime because it is at equal distance from previous prime (21371341) and next prime (21371377).

It is a cyclic number.

It is not a de Polignac number, because 21371359 - 2⁹ = 21370847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21371359.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21371759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10685679 + 10685680.

It is an arithmetic number, because the mean of its divisors is an integer number (10685680).

Almost surely, 2^21371359 is an apocalyptic number.

21371359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21371359 is an equidigital number, since it uses as much as digits as its factorization.

21371359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 21371359 is about 4622.9167199940. The cubic root of 21371359 is about 277.5091964596.

The spelling of 21371359 in words is "twenty-one million, three hundred seventy-one thousand, three hundred fifty-nine".