21148412 has 12 divisors (see below), whose sum is σ = 37068696. Its totient is φ = 10557360.

The previous prime is 21148411. The next prime is 21148427. The reversal of 21148412 is 21484112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148411) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1139 + ... + 6602.

It is an arithmetic number, because the mean of its divisors is an integer number (3089058).

Almost surely, 2^21148412 is an apocalyptic number.

It is an amenable number.

21148412 is a deficient number, since it is larger than the sum of its proper divisors (15920284).

21148412 is a wasteful number, since it uses less digits than its factorization.

21148412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8428 (or 8426 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 21148412 is about 4598.7402622892. The cubic root of 21148412 is about 276.5408250135.

The spelling of 21148412 in words is "twenty-one million, one hundred forty-eight thousand, four hundred twelve".