21254085 has 24 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 11243232.

The previous prime is 21254069. The next prime is 21254087. The reversal of 21254085 is 58045212.

It is a happy number.

It is not a de Polignac number, because 21254085 - 2⁴ = 21254069 is a prime.

It is a super-2 number, since 2×21254085² = 903472258374450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3856 + ... + 7574.

It is an arithmetic number, because the mean of its divisors is an integer number (1547520).

Almost surely, 2^21254085 is an apocalyptic number.

It is an amenable number.

21254085 is a deficient number, since it is larger than the sum of its proper divisors (15886395).

21254085 is a wasteful number, since it uses less digits than its factorization.

21254085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857 (or 3854 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21254085 is about 4610.2152878147. The cubic root of 21254085 is about 277.0006603311. Note that the first 3 decimals are identical.

Adding to 21254085 its reverse (58045212), we get a palindrome (79299297).

The spelling of 21254085 in words is "twenty-one million, two hundred fifty-four thousand, eighty-five".