21169045 has 8 divisors (see below), whose sum is σ = 25472160. Its totient is φ = 16889040.

The previous prime is 21169037. The next prime is 21169061. The reversal of 21169045 is 54096112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21169045 - 2³ = 21169037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691 + ... + 7480.

It is an arithmetic number, because the mean of its divisors is an integer number (3184020).

Almost surely, 2^21169045 is an apocalyptic number.

It is an amenable number.

21169045 is a deficient number, since it is larger than the sum of its proper divisors (4303115).

21169045 is a wasteful number, since it uses less digits than its factorization.

21169045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11555.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21169045 is about 4600.9830471324. The cubic root of 21169045 is about 276.6307295139.

The spelling of 21169045 in words is "twenty-one million, one hundred sixty-nine thousand, forty-five".