21061274 has 8 divisors (see below), whose sum is σ = 34022100. Its totient is φ = 9720576.

The previous prime is 21061259. The next prime is 21061309. The reversal of 21061274 is 47216012.

It can be written as a sum of positive squares in 2 ways, for example, as 20313049 + 748225 = 4507^2 + 865^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404999 + ... + 405050.

Almost surely, 2^21061274 is an apocalyptic number.

21061274 is a deficient number, since it is larger than the sum of its proper divisors (12960826).

21061274 is a wasteful number, since it uses less digits than its factorization.

21061274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810064.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21061274 is about 4589.2563667766. The cubic root of 21061274 is about 276.1604909192.

Adding to 21061274 its reverse (47216012), we get a palindrome (68277286).

It can be divided in two parts, 2106 and 1274, that multiplied together give a square (2683044 = 1638²).

The spelling of 21061274 in words is "twenty-one million, sixty-one thousand, two hundred seventy-four".