21470526 has 72 divisors (see below), whose sum is σ = 59060664. Its totient is φ = 5574240.

The previous prime is 21470521. The next prime is 21470543. The reversal of 21470526 is 62507412.

It is a self number, because there is not a number n which added to its sum of digits gives 21470526.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470521) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8596 + ... + 10808.

It is an arithmetic number, because the mean of its divisors is an integer number (820287).

Almost surely, 2^21470526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29530332).

21470526 is an abundant number, since it is smaller than the sum of its proper divisors (37590138).

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

21470526 is a wasteful number, since it uses less digits than its factorization.

21470526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2236 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21470526 is about 4633.6298945859. The cubic root of 21470526 is about 277.9377653418.

Adding to 21470526 its reverse (62507412), we get a palindrome (83977938).

The spelling of 21470526 in words is "twenty-one million, four hundred seventy thousand, five hundred twenty-six".