21350628 has 120 divisors (see below), whose sum is σ = 62183352. Its totient is φ = 6345216.

The previous prime is 21350621. The next prime is 21350629. The reversal of 21350628 is 82605312.

21350628 is a `hidden beast` number, since 2 + 1 + 35 + 0 + 628 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4359744 + 16990884 = 2088^2 + 4122^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350621) 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 in 39 ways as a sum of consecutive naturals, for example, 155776 + ... + 155912.

Almost surely, 2^21350628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21350628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091676).

21350628 is an abundant number, since it is smaller than the sum of its proper divisors (40832724).

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

21350628 is a wasteful number, since it uses less digits than its factorization.

21350628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21350628 is about 4620.6739768133. The cubic root of 21350628 is about 277.4194360724.

The spelling of 21350628 in words is "twenty-one million, three hundred fifty thousand, six hundred twenty-eight".