21061283 has 8 divisors (see below), whose sum is σ = 22340448. Its totient is φ = 19786624.

The previous prime is 21061259. The next prime is 21061309. The reversal of 21061283 is 38216012.

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 21061283 - 2¹⁸ = 20799139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21061223) 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, 16610 + ... + 17832.

It is an arithmetic number, because the mean of its divisors is an integer number (2792556).

Almost surely, 2^21061283 is an apocalyptic number.

21061283 is a deficient number, since it is larger than the sum of its proper divisors (1279165).

21061283 is a wasteful number, since it uses less digits than its factorization.

21061283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21061283 is about 4589.2573473276. The cubic root of 21061283 is about 276.1605302560.

Adding to 21061283 its reverse (38216012), we get a palindrome (59277295).

The spelling of 21061283 in words is "twenty-one million, sixty-one thousand, two hundred eighty-three".