21473350 has 12 divisors (see below), whose sum is σ = 39940524. Its totient is φ = 8589320.

The previous prime is 21473293. The next prime is 21473351. The reversal of 21473350 is 5337412.

It is a super-2 number, since 2×21473350² = 922209520445000, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473351) 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 5 ways as a sum of consecutive naturals, for example, 214684 + ... + 214783.

It is an arithmetic number, because the mean of its divisors is an integer number (3328377).

Almost surely, 2^21473350 is an apocalyptic number.

21473350 is a deficient number, since it is larger than the sum of its proper divisors (18467174).

21473350 is a wasteful number, since it uses less digits than its factorization.

21473350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429479 (or 429474 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21473350 is about 4633.9346132633. The cubic root of 21473350 is about 277.9499504468.

The spelling of 21473350 in words is "twenty-one million, four hundred seventy-three thousand, three hundred fifty".