21054235 has 8 divisors (see below), whose sum is σ = 25290720. Its totient is φ = 16826304.

The previous prime is 21054233. The next prime is 21054247. The reversal of 21054235 is 53245012.

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

It is a cyclic number.

It is not a de Polignac number, because 21054235 - 2¹ = 21054233 is a prime.

It is a super-2 number, since 2×21054235² = 886561622870450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21054233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6351 + ... + 9079.

It is an arithmetic number, because the mean of its divisors is an integer number (3161340).

Almost surely, 2^21054235 is an apocalyptic number.

21054235 is a deficient number, since it is larger than the sum of its proper divisors (4236485).

21054235 is a wasteful number, since it uses less digits than its factorization.

21054235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21054235 is about 4588.4894028427. The cubic root of 21054235 is about 276.1297218041.

Adding to 21054235 its reverse (53245012), we get a palindrome (74299247).

It can be divided in two parts, 210 and 54235, that added together give a palindrome (54445).

The spelling of 21054235 in words is "twenty-one million, fifty-four thousand, two hundred thirty-five".