21460145 has 16 divisors (see below), whose sum is σ = 30447360. Its totient is φ = 14207424.

The previous prime is 21460141. The next prime is 21460147. The reversal of 21460145 is 54106412.

It is not a de Polignac number, because 21460145 - 2² = 21460141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21460145.

It is not an unprimeable number, because it can be changed into a prime (21460141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9557 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (1902960).

Almost surely, 2^21460145 is an apocalyptic number.

It is an amenable number.

21460145 is a deficient number, since it is larger than the sum of its proper divisors (8987215).

21460145 is a wasteful number, since it uses less digits than its factorization.

21460145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21184.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21460145 is about 4632.5095790511. The cubic root of 21460145 is about 277.8929638144.

Adding to 21460145 its reverse (54106412), we get a palindrome (75566557).

The spelling of 21460145 in words is "twenty-one million, four hundred sixty thousand, one hundred forty-five".