21016360 has 16 divisors (see below), whose sum is σ = 47286900. Its totient is φ = 8406528.

The previous prime is 21016309. The next prime is 21016381. The reversal of 21016360 is 6361012.

It can be written as a sum of positive squares in 2 ways, for example, as 19061956 + 1954404 = 4366^2 + 1398^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262665 + ... + 262744.

Almost surely, 2^21016360 is an apocalyptic number.

21016360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21016360 is an abundant number, since it is smaller than the sum of its proper divisors (26270540).

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

21016360 is a wasteful number, since it uses less digits than its factorization.

21016360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525420 (or 525416 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21016360 is about 4584.3603697790. The cubic root of 21016360 is about 275.9640434850.

Adding to 21016360 its reverse (6361012), we get a palindrome (27377372).

The spelling of 21016360 in words is "twenty-one million, sixteen thousand, three hundred sixty".