21650252 has 18 divisors (see below), whose sum is σ = 41027868. Its totient is φ = 9992112.

The previous prime is 21650249. The next prime is 21650257. The reversal of 21650252 is 25205612.

It is not an unprimeable number, because it can be changed into a prime (21650257) 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, 15338 + ... + 16689.

It is an arithmetic number, because the mean of its divisors is an integer number (2279326).

Almost surely, 2^21650252 is an apocalyptic number.

It is an amenable number.

21650252 is a deficient number, since it is larger than the sum of its proper divisors (19377616).

21650252 is a wasteful number, since it uses less digits than its factorization.

21650252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32057 (or 32042 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21650252 is about 4652.9831291334. The cubic root of 21650252 is about 278.7111341577.

Adding to 21650252 its reverse (25205612), we get a palindrome (46855864).

The spelling of 21650252 in words is "twenty-one million, six hundred fifty thousand, two hundred fifty-two".