21372367 has 2 divisors, whose sum is σ = 21372368. Its totient is φ = 21372366.

The previous prime is 21372353. The next prime is 21372413. The reversal of 21372367 is 76327312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21372367 - 2¹⁵ = 21339599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21372317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686183 + 10686184.

It is an arithmetic number, because the mean of its divisors is an integer number (10686184).

Almost surely, 2^21372367 is an apocalyptic number.

21372367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21372367 is an equidigital number, since it uses as much as digits as its factorization.

21372367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 31.

The square root of 21372367 is about 4623.0257407893. The cubic root of 21372367 is about 277.5135593840.

Adding to 21372367 its reverse (76327312), we get a palindrome (97699679).

The spelling of 21372367 in words is "twenty-one million, three hundred seventy-two thousand, three hundred sixty-seven".