21422250 has 48 divisors (see below), whose sum is σ = 57931848. Its totient is φ = 5712000.

The previous prime is 21422231. The next prime is 21422273. The reversal of 21422250 is 5222412.

It can be written as a sum of positive squares in 4 ways, for example, as 5716881 + 15705369 = 2391^2 + 3963^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2511 + ... + 7010.

Almost surely, 2^21422250 is an apocalyptic number.

21422250 is an abundant number, since it is smaller than the sum of its proper divisors (36509598).

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

21422250 is a wasteful number, since it uses less digits than its factorization.

21422250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9544 (or 9531 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 21422250 is about 4628.4176561758. The cubic root of 21422250 is about 277.7292967242.

Adding to 21422250 its reverse (5222412), we get a palindrome (26644662).

The spelling of 21422250 in words is "twenty-one million, four hundred twenty-two thousand, two hundred fifty".