21054275 has 12 divisors (see below), whose sum is σ = 28481064. Its totient is φ = 15312000.

The previous prime is 21054263. The next prime is 21054277. The reversal of 21054275 is 57245012.

It is not a de Polignac number, because 21054275 - 2⁴ = 21054259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38006 + ... + 38555.

It is an arithmetic number, because the mean of its divisors is an integer number (2373422).

Almost surely, 2^21054275 is an apocalyptic number.

21054275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21054275 is a deficient number, since it is larger than the sum of its proper divisors (7426789).

21054275 is a wasteful number, since it uses less digits than its factorization.

21054275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76582 (or 76577 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21054275 is about 4588.4937615736. The cubic root of 21054275 is about 276.1298966728.

Adding to 21054275 its reverse (57245012), we get a palindrome (78299287).

The spelling of 21054275 in words is "twenty-one million, fifty-four thousand, two hundred seventy-five".