21201250 has 40 divisors (see below), whose sum is σ = 45435456. Its totient is φ = 7266000.

The previous prime is 21201209. The next prime is 21201251. The reversal of 21201250 is 5210212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201250.

It is not an unprimeable number, because it can be changed into a prime (21201251) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7539 + ... + 9961.

Almost surely, 2^21201250 is an apocalyptic number.

21201250 is an abundant number, since it is smaller than the sum of its proper divisors (24234206).

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

21201250 is an equidigital number, since it uses as much as digits as its factorization.

21201250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 21201250 is about 4604.4815126136. The cubic root of 21201250 is about 276.7709401955.

Adding to 21201250 its reverse (5210212), we get a palindrome (26411462).

It can be divided in two parts, 2 and 1201250, that multiplied together give a square (2402500 = 1550²).

The spelling of 21201250 in words is "twenty-one million, two hundred one thousand, two hundred fifty".