21062480 has 40 divisors (see below), whose sum is σ = 51103872. Its totient is φ = 8057984.

The previous prime is 21062453. The next prime is 21062513. The reversal of 21062480 is 8426012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884 + ... + 7563.

Almost surely, 2^21062480 is an apocalyptic number.

21062480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21062480 is an abundant number, since it is smaller than the sum of its proper divisors (30041392).

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

21062480 is a wasteful number, since it uses less digits than its factorization.

21062480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11483 (or 11477 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21062480 is about 4589.3877587321. The cubic root of 21062480 is about 276.1657619393.

Adding to 21062480 its reverse (8426012), we get a palindrome (29488492).

The spelling of 21062480 in words is "twenty-one million, sixty-two thousand, four hundred eighty".