21452250 has 32 divisors (see below), whose sum is σ = 53546688. Its totient is φ = 5720400.

The previous prime is 21452243. The next prime is 21452269. The reversal of 21452250 is 5225412.

It is a happy 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, 13552 + ... + 15051.

It is an arithmetic number, because the mean of its divisors is an integer number (1673334).

Almost surely, 2^21452250 is an apocalyptic number.

21452250 is an abundant number, since it is smaller than the sum of its proper divisors (32094438).

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

21452250 is a wasteful number, since it uses less digits than its factorization.

21452250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28623 (or 28613 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 21452250 is about 4631.6573707475. The cubic root of 21452250 is about 277.8588815027.

Adding to 21452250 its reverse (5225412), we get a palindrome (26677662).

The spelling of 21452250 in words is "twenty-one million, four hundred fifty-two thousand, two hundred fifty".