21014428 has 6 divisors (see below), whose sum is σ = 36775256. Its totient is φ = 10507212.

The previous prime is 21014407. The next prime is 21014429. The reversal of 21014428 is 82441012.

It is a junction number, because it is equal to n+sod(n) for n = 21014399 and 21014408.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626800 + ... + 2626807.

Almost surely, 2^21014428 is an apocalyptic number.

It is an amenable number.

21014428 is a deficient number, since it is larger than the sum of its proper divisors (15760828).

21014428 is a wasteful number, since it uses less digits than its factorization.

21014428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5253611 (or 5253609 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21014428 is about 4584.1496485172. The cubic root of 21014428 is about 275.9555869164.

The spelling of 21014428 in words is "twenty-one million, fourteen thousand, four hundred twenty-eight".