21319470 has 48 divisors (see below), whose sum is σ = 57054960. Its totient is φ = 5664960.

The previous prime is 21319457. The next prime is 21319471. The reversal of 21319470 is 7491312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319471) 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 23 ways as a sum of consecutive naturals, for example, 75730 + ... + 76010.

It is an arithmetic number, because the mean of its divisors is an integer number (1188645).

Almost surely, 2^21319470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21319470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28527480).

21319470 is an abundant number, since it is smaller than the sum of its proper divisors (35735490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21319470 is an equidigital number, since it uses as much as digits as its factorization.

21319470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21319470 is about 4617.3011597686. The cubic root of 21319470 is about 277.2844198566.

It can be divided in two parts, 213 and 19470, that added together give a 9-th power (19683 = 3⁹).

The spelling of 21319470 in words is "twenty-one million, three hundred nineteen thousand, four hundred seventy".