21360371 has 2 divisors, whose sum is σ = 21360372. Its totient is φ = 21360370.

The previous prime is 21360331. The next prime is 21360373. The reversal of 21360371 is 17306312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21360371 - 2²² = 17166067 is a prime.

Together with 21360373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21360373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10680185 + 10680186.

It is an arithmetic number, because the mean of its divisors is an integer number (10680186).

Almost surely, 2^21360371 is an apocalyptic number.

21360371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21360371 is an equidigital number, since it uses as much as digits as its factorization.

21360371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21360371 is about 4621.7281399927. The cubic root of 21360371 is about 277.4616282197.

Adding to 21360371 its reverse (17306312), we get a palindrome (38666683).

The spelling of 21360371 in words is "twenty-one million, three hundred sixty thousand, three hundred seventy-one".