21376250 has 60 divisors (see below), whose sum is σ = 46742850. Its totient is φ = 7308000.

The previous prime is 21376217. The next prime is 21376253. The reversal of 21376250 is 5267312.

It can be written as a sum of positive squares in 5 ways, for example, as 1117249 + 20259001 = 1057^2 + 4501^2 .

It is not an unprimeable number, because it can be changed into a prime (21376253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 61076 + ... + 61424.

Almost surely, 2^21376250 is an apocalyptic number.

21376250 is an abundant number, since it is smaller than the sum of its proper divisors (25366600).

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

21376250 is an equidigital number, since it uses as much as digits as its factorization.

21376250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21376250 is about 4623.4456847680. The cubic root of 21376250 is about 277.5303648833.

The spelling of 21376250 in words is "twenty-one million, three hundred seventy-six thousand, two hundred fifty".