21148037 has 4 divisors (see below), whose sum is σ = 21366156. Its totient is φ = 20929920.

The previous prime is 21148033. The next prime is 21148067. The reversal of 21148037 is 73084112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8288641 + 12859396 = 2879^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 21148037 - 2² = 21148033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21147997 and 21148015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108914 + ... + 109107.

It is an arithmetic number, because the mean of its divisors is an integer number (5341539).

Almost surely, 2^21148037 is an apocalyptic number.

It is an amenable number.

21148037 is a deficient number, since it is larger than the sum of its proper divisors (218119).

21148037 is an equidigital number, since it uses as much as digits as its factorization.

21148037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218118.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21148037 is about 4598.6994900733. The cubic root of 21148037 is about 276.5391904791.

The spelling of 21148037 in words is "twenty-one million, one hundred forty-eight thousand, thirty-seven".