21054283 has 4 divisors (see below), whose sum is σ = 21251160. Its totient is φ = 20857408.

The previous prime is 21054277. The next prime is 21054287. The reversal of 21054283 is 38245012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21054283 - 2²¹ = 18957131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98278 + ... + 98491.

It is an arithmetic number, because the mean of its divisors is an integer number (5312790).

Almost surely, 2^21054283 is an apocalyptic number.

21054283 is a deficient number, since it is larger than the sum of its proper divisors (196877).

21054283 is a wasteful number, since it uses less digits than its factorization.

21054283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196876.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21054283 is about 4588.4946333193. The cubic root of 21054283 is about 276.1299316465.

Adding to 21054283 its reverse (38245012), we get a palindrome (59299295).

The spelling of 21054283 in words is "twenty-one million, fifty-four thousand, two hundred eighty-three".