21225454 has 8 divisors (see below), whose sum is σ = 32614848. Its totient is φ = 10353840.

The previous prime is 21225437. The next prime is 21225473. The reversal of 21225454 is 45452212.

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

It is a super-2 number, since 2×21225454² = 901039795012232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129342 + ... + 129505.

It is an arithmetic number, because the mean of its divisors is an integer number (4076856).

Almost surely, 2^21225454 is an apocalyptic number.

21225454 is a deficient number, since it is larger than the sum of its proper divisors (11389394).

21225454 is a wasteful number, since it uses less digits than its factorization.

21225454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258890.

The product of its digits is 3200, while the sum is 25.

The square root of 21225454 is about 4607.1090718584. The cubic root of 21225454 is about 276.8762235507.

Adding to 21225454 its reverse (45452212), we get a palindrome (66677666).

The spelling of 21225454 in words is "twenty-one million, two hundred twenty-five thousand, four hundred fifty-four".