21350145 has 32 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 10954944.

The previous prime is 21350143. The next prime is 21350159. The reversal of 21350145 is 54105312.

It is not a de Polignac number, because 21350145 - 2¹ = 21350143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21350143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50746 + ... + 51164.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^21350145 is an apocalyptic number.

It is an amenable number.

21350145 is a deficient number, since it is larger than the sum of its proper divisors (14131455).

21350145 is a wasteful number, since it uses less digits than its factorization.

21350145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21350145 is about 4620.6217114150. The cubic root of 21350145 is about 277.4173441027.

Adding to 21350145 its reverse (54105312), we get a palindrome (75455457).

The spelling of 21350145 in words is "twenty-one million, three hundred fifty thousand, one hundred forty-five".