21514420 has 48 divisors (see below), whose sum is σ = 46569600. Its totient is φ = 8346240.

The previous prime is 21514399. The next prime is 21514421. The reversal of 21514420 is 2441512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514421) 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, 154711 + ... + 154849.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^21514420 is an apocalyptic number.

21514420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514420 is an abundant number, since it is smaller than the sum of its proper divisors (25055180).

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

21514420 is a wasteful number, since it uses less digits than its factorization.

21514420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21514420 is about 4638.3639356997. The cubic root of 21514420 is about 278.1270402577.

Adding to 21514420 its reverse (2441512), we get a palindrome (23955932).

The spelling of 21514420 in words is "twenty-one million, five hundred fourteen thousand, four hundred twenty".