21219046 has 8 divisors (see below), whose sum is σ = 31848120. Its totient is φ = 10603008.

The previous prime is 21219013. The next prime is 21219047. The reversal of 21219046 is 64091212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21219046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4710 + ... + 8038.

It is an arithmetic number, because the mean of its divisors is an integer number (3981015).

Almost surely, 2^21219046 is an apocalyptic number.

21219046 is a deficient number, since it is larger than the sum of its proper divisors (10629074).

21219046 is a wasteful number, since it uses less digits than its factorization.

21219046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6518.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21219046 is about 4606.4135724010. The cubic root of 21219046 is about 276.8483576149.

The spelling of 21219046 in words is "twenty-one million, two hundred nineteen thousand, forty-six".