21228714 has 48 divisors (see below), whose sum is σ = 49867272. Its totient is φ = 6488064.

The previous prime is 21228709. The next prime is 21228737. The reversal of 21228714 is 41782212.

21228714 = T₁₅₅ + T₁₅₆ + ... + T₅₀₇.

It can be written as a sum of positive squares in 4 ways, for example, as 19316025 + 1912689 = 4395^2 + 1383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59962 + ... + 60314.

Almost surely, 2^21228714 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21228714, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24933636).

21228714 is an abundant number, since it is smaller than the sum of its proper divisors (28638558).

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

21228714 is a wasteful number, since it uses less digits than its factorization.

21228714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 628 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 21228714 is about 4607.4628593186. The cubic root of 21228714 is about 276.8903978888.

The spelling of 21228714 in words is "twenty-one million, two hundred twenty-eight thousand, seven hundred fourteen".