21946838 has 8 divisors (see below), whose sum is σ = 33620832. Its totient is φ = 10739896.

The previous prime is 21946831. The next prime is 21946867. The reversal of 21946838 is 83864912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21946795 and 21946804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116645 + ... + 116832.

It is an arithmetic number, because the mean of its divisors is an integer number (4202604).

Almost surely, 2^21946838 is an apocalyptic number.

21946838 is a deficient number, since it is larger than the sum of its proper divisors (11673994).

21946838 is a wasteful number, since it uses less digits than its factorization.

21946838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233526.

The product of its digits is 82944, while the sum is 41.

The square root of 21946838 is about 4684.7452438740. The cubic root of 21946838 is about 279.9780510006.

The spelling of 21946838 in words is "twenty-one million, nine hundred forty-six thousand, eight hundred thirty-eight".