21411748 has 6 divisors (see below), whose sum is σ = 37470566. Its totient is φ = 10705872.

The previous prime is 21411737. The next prime is 21411763. The reversal of 21411748 is 84711412.

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 178084 = 4608^2 + 422^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2676465 + ... + 2676472.

Almost surely, 2^21411748 is an apocalyptic number.

It is an amenable number.

21411748 is a deficient number, since it is larger than the sum of its proper divisors (16058818).

21411748 is a wasteful number, since it uses less digits than its factorization.

21411748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352941 (or 5352939 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 21411748 is about 4627.2830040965. The cubic root of 21411748 is about 277.6839048251.

The spelling of 21411748 in words is "twenty-one million, four hundred eleven thousand, seven hundred forty-eight".