21250454 has 8 divisors (see below), whose sum is σ = 31904280. Its totient is φ = 10615696.

The previous prime is 21250451. The next prime is 21250477. The reversal of 21250454 is 45405212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21250454² = 903163590412232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (3988035).

Almost surely, 2^21250454 is an apocalyptic number.

21250454 is a deficient number, since it is larger than the sum of its proper divisors (10653826).

21250454 is a wasteful number, since it uses less digits than its factorization.

21250454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9534.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 21250454 is about 4609.8214715974. The cubic root of 21250454 is about 276.9848853765.

Adding to 21250454 its reverse (45405212), we get a palindrome (66655666).

The spelling of 21250454 in words is "twenty-one million, two hundred fifty thousand, four hundred fifty-four".