21046468 has 6 divisors (see below), whose sum is σ = 36831326. Its totient is φ = 10523232.

The previous prime is 21046463. The next prime is 21046477. The reversal of 21046468 is 86464012.

It can be written as a sum of positive squares in only one way, i.e., 16711744 + 4334724 = 4088^2 + 2082^2 .

It is not an unprimeable number, because it can be changed into a prime (21046463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630805 + ... + 2630812.

Almost surely, 2^21046468 is an apocalyptic number.

It is an amenable number.

21046468 is a deficient number, since it is larger than the sum of its proper divisors (15784858).

21046468 is a wasteful number, since it uses less digits than its factorization.

21046468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261621 (or 5261619 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 21046468 is about 4587.6429677995. The cubic root of 21046468 is about 276.0957624711.

The spelling of 21046468 in words is "twenty-one million, forty-six thousand, four hundred sixty-eight".