21145367 has 2 divisors, whose sum is σ = 21145368. Its totient is φ = 21145366.

The previous prime is 21145363. The next prime is 21145393. The reversal of 21145367 is 76354112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21145367 - 2² = 21145363 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 (21145363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572683 + 10572684.

It is an arithmetic number, because the mean of its divisors is an integer number (10572684).

Almost surely, 2^21145367 is an apocalyptic number.

21145367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145367 is an equidigital number, since it uses as much as digits as its factorization.

21145367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 21145367 is about 4598.4091814453. The cubic root of 21145367 is about 276.5275520354.

Adding to 21145367 its reverse (76354112), we get a palindrome (97499479).

It can be divided in two parts, 21145 and 367, that added together give a palindrome (21512).

The spelling of 21145367 in words is "twenty-one million, one hundred forty-five thousand, three hundred sixty-seven".