21148074 has 16 divisors (see below), whose sum is σ = 46995840. Its totient is φ = 7049340.

The previous prime is 21148067. The next prime is 21148079. The reversal of 21148074 is 47084112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21148079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195762 + ... + 195869.

It is an arithmetic number, because the mean of its divisors is an integer number (2937240).

Almost surely, 2^21148074 is an apocalyptic number.

21148074 is an abundant number, since it is smaller than the sum of its proper divisors (25847766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21148074 is a wasteful number, since it uses less digits than its factorization.

21148074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391642 (or 391636 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21148074 is about 4598.7035129480. The cubic root of 21148074 is about 276.5393517540.

The spelling of 21148074 in words is "twenty-one million, one hundred forty-eight thousand, seventy-four".