21061276 has 18 divisors (see below), whose sum is σ = 38091480. Its totient is φ = 10189080.

The previous prime is 21061259. The next prime is 21061309. The reversal of 21061276 is 67216012.

It is a self number, because there is not a number n which added to its sum of digits gives 21061276.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105 + ... + 6583.

Almost surely, 2^21061276 is an apocalyptic number.

It is an amenable number.

21061276 is a deficient number, since it is larger than the sum of its proper divisors (17030204).

21061276 is a wasteful number, since it uses less digits than its factorization.

21061276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545 (or 5512 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21061276 is about 4589.2565846769. The cubic root of 21061276 is about 276.1604996607.

Adding to 21061276 its reverse (67216012), we get a palindrome (88277288).

The spelling of 21061276 in words is "twenty-one million, sixty-one thousand, two hundred seventy-six".