21296929 has 8 divisors (see below), whose sum is σ = 22515680. Its totient is φ = 20088000.

The previous prime is 21296921. The next prime is 21296939. The reversal of 21296929 is 92969212.

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 21296929 - 2³ = 21296921 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21296891 and 21296900.

It is not an unprimeable number, because it can be changed into a prime (21296921) 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, 2254 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (2814460).

Almost surely, 2^21296929 is an apocalyptic number.

It is an amenable number.

21296929 is a deficient number, since it is larger than the sum of its proper divisors (1218751).

21296929 is a wasteful number, since it uses less digits than its factorization.

21296929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911.

The product of its digits is 34992, while the sum is 40.

The square root of 21296929 is about 4614.8595861629. The cubic root of 21296929 is about 277.1866614508.

The spelling of 21296929 in words is "twenty-one million, two hundred ninety-six thousand, nine hundred twenty-nine".