21148546 has 16 divisors (see below), whose sum is σ = 33312384. Its totient is φ = 10050304.

The previous prime is 21148529. The next prime is 21148549. The reversal of 21148546 is 64584112.

It is not an unprimeable number, because it can be changed into a prime (21148549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6306 + ... + 9058.

It is an arithmetic number, because the mean of its divisors is an integer number (2082024).

Almost surely, 2^21148546 is an apocalyptic number.

21148546 is a deficient number, since it is larger than the sum of its proper divisors (12163838).

21148546 is a wasteful number, since it uses less digits than its factorization.

21148546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945.

The product of its digits is 7680, while the sum is 31.

The square root of 21148546 is about 4598.7548314734. The cubic root of 21148546 is about 276.5414090825.

The spelling of 21148546 in words is "twenty-one million, one hundred forty-eight thousand, five hundred forty-six".