21967406 has 8 divisors (see below), whose sum is σ = 34014144. Its totient is φ = 10629360.

The previous prime is 21967403. The next prime is 21967409. The reversal of 21967406 is 60476912.

It is an interprime number because it is at equal distance from previous prime (21967403) and next prime (21967409).

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

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177095 + ... + 177218.

It is an arithmetic number, because the mean of its divisors is an integer number (4251768).

Almost surely, 2^21967406 is an apocalyptic number.

21967406 is a deficient number, since it is larger than the sum of its proper divisors (12046738).

21967406 is a wasteful number, since it uses less digits than its factorization.

21967406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354346.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 21967406 is about 4686.9399398755. The cubic root of 21967406 is about 280.0654863835.

The spelling of 21967406 in words is "twenty-one million, nine hundred sixty-seven thousand, four hundred six".