21050712 has 64 divisors (see below), whose sum is σ = 59925600. Its totient is φ = 6842880.

The previous prime is 21050707. The next prime is 21050737. The reversal of 21050712 is 21705012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7668 + ... + 10044.

Almost surely, 2^21050712 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 21050712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29962800).

21050712 is an abundant number, since it is smaller than the sum of its proper divisors (38874888).

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

21050712 is a wasteful number, since it uses less digits than its factorization.

21050712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 21050712 is about 4588.1054913766. The cubic root of 21050712 is about 276.1143193720.

Adding to 21050712 its reverse (21705012), we get a palindrome (42755724).

The spelling of 21050712 in words is "twenty-one million, fifty thousand, seven hundred twelve".