21169245 has 8 divisors (see below), whose sum is σ = 33870816. Its totient is φ = 11290256.

The previous prime is 21169241. The next prime is 21169261. The reversal of 21169245 is 54296112.

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

It is a cyclic number.

It is not a de Polignac number, because 21169245 - 2² = 21169241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705627 + ... + 705656.

It is an arithmetic number, because the mean of its divisors is an integer number (4233852).

Almost surely, 2^21169245 is an apocalyptic number.

It is an amenable number.

21169245 is a deficient number, since it is larger than the sum of its proper divisors (12701571).

21169245 is a wasteful number, since it uses less digits than its factorization.

21169245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411291.

The product of its digits is 4320, while the sum is 30.

The square root of 21169245 is about 4601.0047815667. The cubic root of 21169245 is about 276.6316006912.

The spelling of 21169245 in words is "twenty-one million, one hundred sixty-nine thousand, two hundred forty-five".