21856035 has 8 divisors (see below), whose sum is σ = 34969680. Its totient is φ = 11656544.

The previous prime is 21856031. The next prime is 21856039. The reversal of 21856035 is 53065812.

It is an interprime number because it is at equal distance from previous prime (21856031) and next prime (21856039).

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 21856035 - 2² = 21856031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21855993 and 21856011.

It is not an unprimeable number, because it can be changed into a prime (21856031) 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, 728520 + ... + 728549.

It is an arithmetic number, because the mean of its divisors is an integer number (4371210).

Almost surely, 2^21856035 is an apocalyptic number.

21856035 is a deficient number, since it is larger than the sum of its proper divisors (13113645).

21856035 is a wasteful number, since it uses less digits than its factorization.

21856035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457077.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 21856035 is about 4675.0438500617. The cubic root of 21856035 is about 279.5913895396.

The spelling of 21856035 in words is "twenty-one million, eight hundred fifty-six thousand, thirty-five".