21368145 has 16 divisors (see below), whose sum is σ = 35292672. Its totient is φ = 11028480.

The previous prime is 21368107. The next prime is 21368153. The reversal of 21368145 is 54186312.

It is not a de Polignac number, because 21368145 - 2⁸ = 21367889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22512 + ... + 23441.

It is an arithmetic number, because the mean of its divisors is an integer number (2205792).

Almost surely, 2^21368145 is an apocalyptic number.

It is an amenable number.

21368145 is a deficient number, since it is larger than the sum of its proper divisors (13924527).

21368145 is a wasteful number, since it uses less digits than its factorization.

21368145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45992.

The product of its digits is 5760, while the sum is 30.

The square root of 21368145 is about 4622.5690908844. The cubic root of 21368145 is about 277.4952843935.

The spelling of 21368145 in words is "twenty-one million, three hundred sixty-eight thousand, one hundred forty-five".