21254055 has 8 divisors (see below), whose sum is σ = 34006512. Its totient is φ = 11335488.

The previous prime is 21254041. The next prime is 21254069. The reversal of 21254055 is 55045212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21254041) and next prime (21254069).

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

It is not a de Polignac number, because 21254055 - 2⁴ = 21254039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708454 + ... + 708483.

It is an arithmetic number, because the mean of its divisors is an integer number (4250814).

Almost surely, 2^21254055 is an apocalyptic number.

21254055 is a deficient number, since it is larger than the sum of its proper divisors (12752457).

21254055 is a wasteful number, since it uses less digits than its factorization.

21254055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416945.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 21254055 is about 4610.2120341694. The cubic root of 21254055 is about 277.0005300029. Note that the first 3 decimals are identical.

Adding to 21254055 its reverse (55045212), we get a palindrome (76299267).

The spelling of 21254055 in words is "twenty-one million, two hundred fifty-four thousand, fifty-five".