21270046 has 16 divisors (see below), whose sum is σ = 36698976. Its totient is φ = 9056736.

The previous prime is 21270037. The next prime is 21270071. The reversal of 21270046 is 64007212.

It is a junction number, because it is equal to n+sod(n) for n = 21269999 and 21270026.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2641 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2293686).

Almost surely, 2^21270046 is an apocalyptic number.

21270046 is a deficient number, since it is larger than the sum of its proper divisors (15428930).

21270046 is a wasteful number, since it uses less digits than its factorization.

21270046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9843.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21270046 is about 4611.9460100916. The cubic root of 21270046 is about 277.0699819271.

Adding to 21270046 its reverse (64007212), we get a palindrome (85277258).

The spelling of 21270046 in words is "twenty-one million, two hundred seventy thousand, forty-six".