21148146 has 12 divisors (see below), whose sum is σ = 45821022. Its totient is φ = 7049376.

The previous prime is 21148133. The next prime is 21148157. The reversal of 21148146 is 64184112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 3381921 = 4215^2 + 1839^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587431 + ... + 587466.

Almost surely, 2^21148146 is an apocalyptic number.

21148146 is an abundant number, since it is smaller than the sum of its proper divisors (24672876).

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

21148146 is a wasteful number, since it uses less digits than its factorization.

21148146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174905 (or 1174902 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21148146 is about 4598.7113412346. The cubic root of 21148146 is about 276.5396655858.

The spelling of 21148146 in words is "twenty-one million, one hundred forty-eight thousand, one hundred forty-six".