21270367 has 8 divisors (see below), whose sum is σ = 22867200. Its totient is φ = 19721304.

The previous prime is 21270323. The next prime is 21270373. The reversal of 21270367 is 76307212.

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-21270367 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270307) 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, 11017 + ... + 12802.

It is an arithmetic number, because the mean of its divisors is an integer number (2858400).

Almost surely, 2^21270367 is an apocalyptic number.

21270367 is a deficient number, since it is larger than the sum of its proper divisors (1596833).

21270367 is a wasteful number, since it uses less digits than its factorization.

21270367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23885.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21270367 is about 4611.9808108881. The cubic root of 21270367 is about 277.0713757341.

Adding to 21270367 its reverse (76307212), we get a palindrome (97577579).

The spelling of 21270367 in words is "twenty-one million, two hundred seventy thousand, three hundred sixty-seven".