21270670 has 8 divisors (see below), whose sum is σ = 38287224. Its totient is φ = 8508264.

The previous prime is 21270643. The next prime is 21270673. The reversal of 21270670 is 7607212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063524 + ... + 1063543.

It is an arithmetic number, because the mean of its divisors is an integer number (4785903).

Almost surely, 2^21270670 is an apocalyptic number.

21270670 is a deficient number, since it is larger than the sum of its proper divisors (17016554).

21270670 is a wasteful number, since it uses less digits than its factorization.

21270670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127074.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21270670 is about 4612.0136599971. The cubic root of 21270670 is about 277.0726913709.

Adding to 21270670 its reverse (7607212), we get a palindrome (28877882).

The spelling of 21270670 in words is "twenty-one million, two hundred seventy thousand, six hundred seventy".