21315367 has 8 divisors (see below), whose sum is σ = 22426992. Its totient is φ = 20232000.

The previous prime is 21315353. The next prime is 21315373. The reversal of 21315367 is 76351312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21315367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5509 + ... + 8542.

It is an arithmetic number, because the mean of its divisors is an integer number (2803374).

Almost surely, 2^21315367 is an apocalyptic number.

21315367 is a deficient number, since it is larger than the sum of its proper divisors (1111625).

21315367 is a wasteful number, since it uses less digits than its factorization.

21315367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14129.

The product of its digits is 3780, while the sum is 28.

The square root of 21315367 is about 4616.8568312219. The cubic root of 21315367 is about 277.2666306250.

Adding to 21315367 its reverse (76351312), we get a palindrome (97666679).

The spelling of 21315367 in words is "twenty-one million, three hundred fifteen thousand, three hundred sixty-seven".