21250712 has 48 divisors (see below), whose sum is σ = 48386160. Its totient is φ = 8707776.

The previous prime is 21250709. The next prime is 21250771. The reversal of 21250712 is 21705212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7838 + ... + 10194.

It is an arithmetic number, because the mean of its divisors is an integer number (1008045).

Almost surely, 2^21250712 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 21250712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24193080).

21250712 is an abundant number, since it is smaller than the sum of its proper divisors (27135448).

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

21250712 is a wasteful number, since it uses less digits than its factorization.

21250712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 2389 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21250712 is about 4609.8494552425. The cubic root of 21250712 is about 276.9860063221.

Adding to 21250712 its reverse (21705212), we get a palindrome (42955924).

The spelling of 21250712 in words is "twenty-one million, two hundred fifty thousand, seven hundred twelve".