21050600 has 24 divisors (see below), whose sum is σ = 48943110. Its totient is φ = 8420160.

The previous prime is 21050597. The next prime is 21050609. The reversal of 21050600 is 605012.

It can be written as a sum of positive squares in 3 ways, for example, as 10252804 + 10797796 = 3202^2 + 3286^2 .

It is not an unprimeable number, because it can be changed into a prime (21050609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52427 + ... + 52826.

Almost surely, 2^21050600 is an apocalyptic number.

21050600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21050600 is an abundant number, since it is smaller than the sum of its proper divisors (27892510).

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

21050600 is a wasteful number, since it uses less digits than its factorization.

21050600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105269 (or 105260 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21050600 is about 4588.0932858869. The cubic root of 21050600 is about 276.1138296837.

Adding to 21050600 its reverse (605012), we get a palindrome (21655612).

The spelling of 21050600 in words is "twenty-one million, fifty thousand, six hundred".