21014420 has 48 divisors (see below), whose sum is σ = 50695680. Its totient is φ = 7167744.

The previous prime is 21014407. The next prime is 21014429. The reversal of 21014420 is 2441012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21014395 and 21014404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014429) 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, 51176 + ... + 51584.

It is an arithmetic number, because the mean of its divisors is an integer number (1056160).

Almost surely, 2^21014420 is an apocalyptic number.

21014420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21014420 is an abundant number, since it is smaller than the sum of its proper divisors (29681260).

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

21014420 is a wasteful number, since it uses less digits than its factorization.

21014420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21014420 is about 4584.1487759452. The cubic root of 21014420 is about 275.9555518985.

Adding to 21014420 its reverse (2441012), we get a palindrome (23455432).

The spelling of 21014420 in words is "twenty-one million, fourteen thousand, four hundred twenty".