21270364 has 12 divisors (see below), whose sum is σ = 37269288. Its totient is φ = 10622000.

The previous prime is 21270323. The next prime is 21270373. The reversal of 21270364 is 46307212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (3105774).

Almost surely, 2^21270364 is an apocalyptic number.

It is an amenable number.

21270364 is a deficient number, since it is larger than the sum of its proper divisors (15998924).

21270364 is a wasteful number, since it uses less digits than its factorization.

21270364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596 (or 6594 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21270364 is about 4611.9804856482. The cubic root of 21270364 is about 277.0713627080.

Adding to 21270364 its reverse (46307212), we get a palindrome (67577576).

The spelling of 21270364 in words is "twenty-one million, two hundred seventy thousand, three hundred sixty-four".