21470460 has 48 divisors (see below), whose sum is σ = 65584512. Its totient is φ = 5204800.

The previous prime is 21470443. The next prime is 21470461. The reversal of 21470460 is 6407412.

It is a super-2 number, since 2×21470460² = 921961305223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21470460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15606 + ... + 16925.

It is an arithmetic number, because the mean of its divisors is an integer number (1366344).

Almost surely, 2^21470460 is an apocalyptic number.

21470460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21470460 is an abundant number, since it is smaller than the sum of its proper divisors (44114052).

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

21470460 is a wasteful number, since it uses less digits than its factorization.

21470460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32554 (or 32552 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21470460 is about 4633.6227727341. The cubic root of 21470460 is about 277.9374805497.

Adding to 21470460 its reverse (6407412), we get a palindrome (27877872).

The spelling of 21470460 in words is "twenty-one million, four hundred seventy thousand, four hundred sixty".