21469145 has 16 divisors (see below), whose sum is σ = 27531840. Its totient is φ = 16023744.

The previous prime is 21469121. The next prime is 21469163. The reversal of 21469145 is 54196412.

It is a cyclic number.

It is not a de Polignac number, because 21469145 - 2¹⁰ = 21468121 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, 4679 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (1720740).

Almost surely, 2^21469145 is an apocalyptic number.

It is an amenable number.

21469145 is a deficient number, since it is larger than the sum of its proper divisors (6062695).

21469145 is a wasteful number, since it uses less digits than its factorization.

21469145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464.

The product of its digits is 8640, while the sum is 32.

The square root of 21469145 is about 4633.4808729507. The cubic root of 21469145 is about 277.9318061603.

The spelling of 21469145 in words is "twenty-one million, four hundred sixty-nine thousand, one hundred forty-five".