21270134 has 4 divisors (see below), whose sum is σ = 31905204. Its totient is φ = 10635066.

The previous prime is 21270133. The next prime is 21270143. The reversal of 21270134 is 43107212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5317532 + ... + 5317535.

It is an arithmetic number, because the mean of its divisors is an integer number (7976301).

Almost surely, 2^21270134 is an apocalyptic number.

21270134 is a deficient number, since it is larger than the sum of its proper divisors (10635070).

21270134 is a wasteful number, since it uses less digits than its factorization.

21270134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10635069.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21270134 is about 4611.9555505230. The cubic root of 21270134 is about 277.0703640314.

Adding to 21270134 its reverse (43107212), we get a palindrome (64377346).

The spelling of 21270134 in words is "twenty-one million, two hundred seventy thousand, one hundred thirty-four".