21060281 has 8 divisors (see below), whose sum is σ = 23290464. Its totient is φ = 18882720.

The previous prime is 21060269. The next prime is 21060287. The reversal of 21060281 is 18206012.

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 21060281 - 2¹⁸ = 20798137 is a prime.

It is a super-2 number, since 2×21060281² = 887070871597922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21060287) 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, 12311 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (2911308).

Almost surely, 2^21060281 is an apocalyptic number.

It is an amenable number.

21060281 is a deficient number, since it is larger than the sum of its proper divisors (2230183).

21060281 is a wasteful number, since it uses less digits than its factorization.

21060281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26311.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21060281 is about 4589.1481780391. The cubic root of 21060281 is about 276.1561506994.

Adding to 21060281 its reverse (18206012), we get a palindrome (39266293).

The spelling of 21060281 in words is "twenty-one million, sixty thousand, two hundred eighty-one".