21067450 has 12 divisors (see below), whose sum is σ = 39185550. Its totient is φ = 8426960.

The previous prime is 21067441. The next prime is 21067477. The reversal of 21067450 is 5476012.

It can be written as a sum of positive squares in 3 ways, for example, as 16152361 + 4915089 = 4019^2 + 2217^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 210625 + ... + 210724.

Almost surely, 2^21067450 is an apocalyptic number.

21067450 is a deficient number, since it is larger than the sum of its proper divisors (18118100).

21067450 is a wasteful number, since it uses less digits than its factorization.

21067450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421361 (or 421356 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21067450 is about 4589.9291933536. The cubic root of 21067450 is about 276.1874820137.

The spelling of 21067450 in words is "twenty-one million, sixty-seven thousand, four hundred fifty".