21292105 has 8 divisors (see below), whose sum is σ = 25575552. Its totient is φ = 17017008.

The previous prime is 21292099. The next prime is 21292147. The reversal of 21292105 is 50129212.

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 21292105 - 2⁹ = 21291593 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian 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, 7744 + ... + 10126.

It is an arithmetic number, because the mean of its divisors is an integer number (3196944).

Almost surely, 2^21292105 is an apocalyptic number.

It is an amenable number.

21292105 is a deficient number, since it is larger than the sum of its proper divisors (4283447).

21292105 is a wasteful number, since it uses less digits than its factorization.

21292105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21292105 is about 4614.3368971067. The cubic root of 21292105 is about 277.1657312121.

The spelling of 21292105 in words is "twenty-one million, two hundred ninety-two thousand, one hundred five".