21370546 has 4 divisors (see below), whose sum is σ = 32055822. Its totient is φ = 10685272.

The previous prime is 21370537. The next prime is 21370549. The reversal of 21370546 is 64507312.

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

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 622521 = 4555^2 + 789^2 .

It is not an unprimeable number, because it can be changed into a prime (21370549) 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 as a sum of consecutive naturals, namely, 5342635 + ... + 5342638.

Almost surely, 2^21370546 is an apocalyptic number.

21370546 is a deficient number, since it is larger than the sum of its proper divisors (10685276).

21370546 is a wasteful number, since it uses less digits than its factorization.

21370546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685275.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21370546 is about 4622.8287876581. The cubic root of 21370546 is about 277.5056774533.

Adding to 21370546 its reverse (64507312), we get a palindrome (85877858).

The spelling of 21370546 in words is "twenty-one million, three hundred seventy thousand, five hundred forty-six".